1 . It is not unusual for teenagers to face the same challenge, so ________ ________ ________ ________   (没有必要) to worry too much about it. (根据汉语提示完成句子)

2 . The Pyramid, which dates from thousands of years ago, ____________ (属于) Egypt. (根据汉语提示完成句子)

3 . These workers preferred to work extra hours on the weekend____________ (而不是)leave the work until the next week. (根据汉语提示完成句子)

4 . Old photos always____________us____________ (提醒) the precious memories of the past.(根据汉语提示完成句子)

5 . Primary consumers rely on vegetation to provide energy, such as sheep and goats, who ________ ________ (以……为食) green plants. (根据汉语提示完成句子)

6 . ________ ________ (如果……怎么办？) I can’t understand the local people when I get to America? (根据汉语提示完成句子)

7 . They were not allowed to return to their home town until the war was over. (改为倒装句)
Not until the war ________ ________ ________ ________ allowed to return to their hometown.

8 . The difference may be so small that no one __________ __________ __________ (知道) it. (aware) (根据汉语提示完成句子)