—May I speak to your manager Mr.Williams at five o’clock tonight? —I’m sorry. Mr. Williams ________ to a conference long before then.
Curious and ________, I rushed out of my dormitory when I heard the noise of three gunshots.
There are some tall trees in our campus, some ________ more than forty meters.
People believe that the China Dream is not very difficult ________ so long as the whole nation works hard for it.
These diagrams are especially helpful when we have a concrete problem ________ at hand.
At last, we found ourselves at the foot of a hill with trees providing shade and ________ down to eat our picnic lunch.