1 . ________________is important for you that we should study hard . （所给词的适当形式填空）

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 . Persistence is what __________ takes to achieve your goal.(用适当的词填空)

4 . ___________ is likely that men are more likely to have heart attacks than women. (用适当的词填空)

5 . ________ is very likely that she will ring me tonight. (用适当的词填空)

6 . ________ is known to us is that it’s human’s activity that leads to global warming. （用适当的词填空）

7 . ________is reported that the way people spend their holidays has changed a great deal in the past ten years. (用适当的词填空)

8 . The big brains make ________ harder for the body to move around and consume more energy.（用适当的词填空）

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

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