1 . So I thought ________ would be useful to include some humor tips for everyday life.(用适当的词填空)

2 . The pouring rain that night made it hard for witnesses ____________ (identify) the murderer. (所给词的适当形式填空)

3 . You can count on it ______ the sun will rise in the east every morning. (用适当的词填空)

4 . I found ______ useless trying to talk him out of buying the expensive toy. (用适当的词填空)

5 . I think ______ interesting to read English storybooks and it’s a great way to improve my English.(用适当的词填空)

6 . The damaged roads made _______ difficult to deliver food and supplies to those in need. (用适当的词填空)

7 . The research reveals that teenagers find ________ difficult to concentrate on their study after playing mobile games continuously for an hour. (用适当的词填空)

9 . ________ shocked us that as many as 100 species of fish, some unique to these waters, may have been affected by the pollution. (用适当的词填空)

10 . __________is not unusual to see American university students drive to school every day. (用适当的词填空)