10. 解析:　 选A。考查非谓语动词。根据句意 “下周参加考试”，可知表示将来的动作，故with 复合结构使用不定式。现在分词表示进行，过去分词表示完成。表示“忙于……”时，busy 后用doing sth.或with sth.。故选A项。

9. 解析:　 选A。考查状语从句。however引导让步状语从句，相当于no matter how。故选A。

5. All the children were involved in the school play.

?提升练习

4. On my way to go to school yesterday morning I met an old friend by accident.

3. I don’t like the way he looks at me up and down before speaking to me.

2. Opinions vary on this point.

5. unconscious

3. staring4. communication

1. threatening2. spread

3. gave out4. give up5. give in