用所给动词的适当形式填空。

1. There _____ some apple juice in that glass. (be)

2. My cousin often _____ TV on Sunday morning. (watch)

3. Would you like _____ to birthday party this Saturday afternoon? (come)

4. We can't _____ the English newspaper home. (take)

5. Andy's father _____ any housework at home. (not do)

6. Many students in my class enjoy _____ badminton after school. (play)

7. All the students must _____ hard at school. (work)

8. Sarah's friend Amy _____ a new teddy bear. (have)

9. What do you want _____ for Sandy's birthday? (buy)

10. Some of my classmates are good at _____. (swim)

（８分）如图所示装置 ，绳重及摩擦不计，装卸工人将重为800N的货物提至高处，人对绳的拉力F为500N，货物在1min内匀速上升了5m。

（1）请在图上画出绳子的绕法；

（2）求滑轮组的机械效率；

（3）如果重物是600N，要把重物提升5m，求拉力做的功。