1 She will eat too much chocolate. She will get fat.（合并为一个复合句）

If she   (1)  too much chocolate, she   (2)     (3)  fat.

2This volunteer work takes him several hours a week. (改为同义句)

He  (4)   several hours a week   (5)  this volunteer work.

3 Lilei is busy with his lessons. (改为同义句)Lilei is busy   (6)   his lessons.

4 The girl was singing when he got the party. (改为一般疑问句)  (7)  the girl   (8)  when he got the part?

5 He has a sore back. (改为一般疑问句)  (9)   he    (10)  a sore back?