1 . However, the railway quickly proved to be a great success and within six months, more than 25,000 people were using ________ every day. (用适当的词填空)
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2 . ________ takes more than three hours of driving on the mountain roads to get there, and the journey requires driving skills and courage. (用适当的词填空)
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3 . Besides，almost every country has made ________ a must that students learn English in colleges. (用适当的词填空)
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4 . 人们普遍认为失败是成功之母。
________ failure is the mother of success.
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5 . ________ is estimated that coral reefs contribute billions of dollars to the world economy annually, providing food, protection of shorelines, and jobs. (用适当的词填空)
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6 . Some people have expressed skepticism because it is unbelievable ________ she looks so perfect after a long day of work in the fields. (用适当的词填空)
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7 . 人们希望这些发现能为了解宇宙的起源提供新的窗口。(形式主语)
________________ these discoveries can offer a new window into the origin of the universe.
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8 . 在乒乓球锦标赛上，他连续打出了几个高难度的弧圈球，让对手难以招架。(形式主语)
In the Table Tennis Tournament, he played several high difficulty loop balls________________ and ________________ .
In the Table Tennis Tournament, he played several high difficulty loop balls
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9 . 大家公认海洋在地球上起着至关重要的作用。
________ the ocean plays a key role in our planet.
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10 . Although I have been working hard, I can’t keep up with others, and this bothers me greatly. (同义句转换)
→Although I have been working hard,________ I can’t keep up with others. (it作形式主语)
→Although I have been working hard,________ I can’t keep up with others. (what引导主语从句)
→Although I have been working hard,
→Although I have been working hard,
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