1 . Eventually Tom made a hole and ________ ________ ________ ________（让水流了出去）. (根据汉语提示完成句子)

2 . As every developer knows, having different systems__________(协调工作)is a common challenge. (根据汉语提示完成句子)

3 . The professor tried his best to make the students___________ what he was saying, but he found it hard to make himself___________.(understand)（所给词的适当形式填空）

4 . To make it easier to get in touch with us, you’d better _____(keep) this card at hand. (所给词的适当形式填空)

5 . _____________(与其引起麻烦), he went away. （根据汉语提示完成句子）

6 . You’d better______________________(不要搬动家具). (根据汉语提示完成句子)

7 . _____________________(我们最好留在)in the open area when an earthquake happens. (根据汉语提示完成句子)

8 . My mother would rather go to work than ______________(stay) at home. (所给词的适当形式填空)

9 . The director had her assistant_________(pick) up some documents for the meeting. (所给词的适当形式填空)