1 . Think carefully before you answer questions online. You may give ________ very important personal information. (用适当的词填空)

2 . Fireflies（萤火虫）will give ________ flashes of light when they fly at night. (用适当的词填空)

3 . My cousin promised his mother never to lie to her, _______, he did so again. (用适当的词填空)

4 . The devoted mother is greatly concerned with her children, ________, she has won great success in educating them. (用适当的词填空)

5 . Playing on a frozen sports field sounds like a lot of fun. Isn’t it rather risky, ________? (用适当的词填空)

7 . __________ (因此), there is a real concern throughout Europe about the damage to the forest environment which threatens these three basic roles. (根据汉语提示单词拼写)

8 . ________ (与此同时), I am looking forward to hearing from you as soon as possible. (根据汉语提示单词拼写)

9 . When studying a______, everybody may experience culture shock.(根据首字母单词拼写)

10 . 会议只持续了一个小时。
The meeting lasted___________ ___________ ___________an hour.