1．________ about wild plants that they decided to make a trip to Madagascar for further research.

A．So curious the couple was　 　　　　B．So curious were the couple

C．How curious the couple were　 　　D．The couple was such curious

解析：此句的语序应该是The couple were so curious about wild plants that...，可以把so置于句首，后面引起倒装，所以要选B。the couple意为“夫妇”，作主语时，谓语动词用复数形式，可排除A和D，此句是so...that结构，所以选项C也可排除。

答案：B

8．banned　9.cigarettes　10.reduced

10．They’ve r________ the prices in the shop，so it’s a good time to buy.

答案：1.burglaries　2.illegal　3.participants　4.addicted　5.treatment　6.recognized　7.disagreed

9．The old soldier used all he had to buy a pack of c________.

8．Smoking is b________ in some public places，such as on the bus and at the cinema.

7．I was for the plan，but he d________ to it.

6．She came home so thin and weak that even her own children hardly r________ her.

5．The best ________(疗法)for a cold is to rest and drink more water.

4．We should help the boy ________(沉迷)to computer games.

3．Would ________(参赛者)in the next race come forward?