He said, “ What is the matter?” —-He asked.

I’m sure you know the difference _____”look for” and “find”.

At our factory there are a few machines similarto _______ described in this magazine

（2014年安徽省合肥市高三第三次教学质量检测）27The general manager can’t use his office at the moment, which ______

Doctor Nathan is said to have been ________to researching into wild animals inAfrica for more than ten years.