1．When his mother came in, he pretended (假装) to be doing his homework.
2．The teacher remarked (评论) that the article was well written.
3．By focusing (注重) on saving oil, water, paper, food and clothing, we are playing a part in cutting down on waste.
4．There's no doubt that the consumers are still very sensitive (敏感的) to the price.
5．Once you form the habit of blaming (指责) somebody or something else for a bad situation, you are a loser.
6．Despite such a big difference in attitude (看法) towards what one eats, there is no doubt that people in the West regard the Chinese food as something special.
7．He was even more cautious (谨慎的) than ever, and did his utmost to win the trust and favour of the superior.
8．If you export nothing but raw materials, you will be at the mercy (怜悯) of world prices.
9．Without pausing (停顿) for breath he walked straight to the office.
10．She is new here, so naturally she is eager (热切的) for friendship.
11．I knocked on the door and tried to wake up the children，but they didn't respond (回应) at all.
12．He admitted (承认) having taken the money but promised never to do it again.
13．I feel sorry for my behavior yesterday and please accept my sincere apology (道歉)．
14．I will have to argue (争论) this out with you another time.
15．He said he felt betrayed (背叛) by his friend John at first.
