—I hear they took ____ active part in the school sports meeting.—_____ good boys they are!A.a; What a B. an; How C. an; What
Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉).
—What shall we do this Saturday? — it rains, we’ll have a picnic in Century Park.
It's a pity that I didn't think of ringing you .
To remember things accurately, we don't allow other thoughts our mind.
If you travel around the world, you will be surprised at ________.