To make members of a team perform better, the trainer first of all has to know their ______ and weaknesses.
The gravity on the earth is much ______ that on the moon, do you know why?
_____ by a black hole, Li Yanping was so frightened at first, but he calmed down later and tried his best to escape.
Mary has______ speaking dialects, so it is not surprising to see her communicate with the people from different parts of this country easily.
We don’t have to ________ every word that we don’t know when reading.
We’ll discuss the problem ________ lunch time.