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)

6 . He was ____________ eager to know the result of the examination. (用适当的词填空)

7 . It is generally believed that you can’t be ____________careful when crossing the street. (用适当的词填空)

8 . Since after-class activities will not ________(mere) make your school life colorful but also improve your learning, why not take an active part in them? (所给词的适当形式填空)

9 . Sharing encourages us to reuse items, thus cutting _____on waste. (用适当的词填空)

10 . We are trying to raise public awareness of environmental protection, ________(particular) air pollution. （所给词的适当形式填空）