Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-139

(23) __________. However, a simple change in perspective can counteract this tendency. The practice of keeping a daily gratitude journal actively shifts one's attention from daily frustrations to positive experiences. (24) __________

A wedge is one of the six classical simple machines. Its main purpose is to separate two objects, or portions of an object, by applying force. You can find wedges everywhere in your daily life, from a simple doorstop to the blade of a knife. The scientific (25) __________ behind it is fascinating: it transforms a force applied to its blunt end into forces perpendicular to its inclined surfaces.

Engineers have to (26) __________ the ideal angle for a wedge depending on its function. For instance, an axe needs a sharp angle to split wood effectively. If an axe blade (27) __________ a very wide angle, it would require much more effort to split a log. (28) __________, the narrower the wedge, the greater its mechanical advantage. (29) __________ side of the wedge exerts pressure outwards, pushing the material apart. This simple tool is also used to lift heavy objects or hold them (30) __________ place, like a doorstop preventing a door from closing.

Across the globe, a powerful movement is growing, led by young people demanding action on climate change. Inspired by international figures, Vietnam has its own 'Green Generation'. These teenagers and young adults are not waiting for the future; they are actively working to protect their environment today. They believe that small, consistent actions can lead to significant changes, proving that age is not a barrier to making a positive impact on the world.

One major area of focus for these youth-led groups is hands-on community work. Groups like the Green Youth Collective organize regular events to clean up polluted canals in big cities or plant new trees in deforested areas. They initiate these projects themselves, gathering volunteers through schools and social clubs. The goal is to create visible, immediate improvements in their local environment and inspire others to join their cause through direct participation.

Alongside these physical activities, digital activism plays an equally crucial role. Young Vietnamese environmentalists are experts at using social media platforms to raise awareness. They create engaging content, such as videos and infographics, to explain complex environmental issues in an easy-to-understand way. These online campaigns can reach thousands of people, spreading important messages far beyond their local communities and encouraging nationwide discussions about sustainability.

Ultimately, the impact of this Green Generation goes beyond just cleaner streets or more trees. Their greatest achievement is shifting mindsets. By taking action, they demonstrate to their peers and to adults that environmental protection is everyone's responsibility. They are showing that you don't need to be a government official or a scientist to contribute; you just need passion and the will to start, proving that collective small efforts create a powerful force for change.

The gig economy, powered by apps like Uber and Deliveroo, offers a new way of working that many find attractive. At first glance, the promise of being your own boss and choosing your own hours seems like a dream come true. (37) __________. However, this freedom often comes at a high price.

Many gig workers face significant instability, (38) __________. This means that an unexpected illness or a quiet week can create serious financial problems. (39) __________. Ultimately, while it provides opportunities, the gig economy also creates a challenging environment where workers must constantly hustle to secure their next paycheck, (40) __________.

A. making long-term financial planning incredibly difficult

B. Critics argue this model transfers too much risk from companies to individuals

C. lacking the traditional benefits that full-time employees enjoy, such as paid sick leave and retirement plans

D. This flexibility is especially appealing to students and those needing to supplement their income