1 . Learning a foreign language involves ____________ (grasp) unfamiliar grammar rules and communication skills. (所给词的适当形式填空)

2 . ________by a shark was what used to happen in those days.

A．kill

B．killing

C．killed

D．being killed

3 . I wake up to the sound of the wind __________ the cloth of my tent. (根据句意单词拼写)

4 . 众所周知，光说不做是没有用的。
As we all know, it is no use ____________.

5 . He spent the evening w________ (包裹) up the Christmas presents. (根据中英文提示单词拼写)

6 . I would advise people to think very carefully about ______(commit) themselves to working Sundays. (所给词的适当形式填空)

7 . She spent years________ (观察) their daily activities. (根据汉语提示单词拼写）