—Mr. Smith would you have some more ice-cream?—No thanks. It’s very good but I have to

问题补充：

—Mr. Smith, would you have some more ice-cream?

—No, thanks. It’s very good, but I have to my weight, you know.

A. watch

B. remain

C. pull

D. gain

答案：

(答案→)A. watch

B. remain

C. pull

D. gain

解析：句意：--史密斯先生，你要冰淇淋吗？--不要，谢谢。它很好，但是我不得不注意我的体重了，你知道的。watch关注； remain 保持； pull 拉； gain获得。根据句意故选A。