What do you usually do____ Sunday mornings. A. in B. at C. on
We visited the factory __ ___ makes toys for children.
—Can you make sure __ ___?— Sorry, I can’t. But I did see her just now.
Our English teacher often uses different activities_ __ keep us_ __ in class.
On Spring Festival’s Eve, people _____ home to get together with their families.
The ship _____ for twenty minutes. You have to wait for the next.