The little elephant is afraid to go alone.He always walks _________ his mother.
--- My dream is to build university on the moon some day. --- It sounds like unusual dream. I wish you could realize it.
The songs of Jay Chou are very popular _______ young people.
We’re going for a picnic tomorrow. I _______ whether Jack can come.
The students were singing an English song _______ Mr. Xiang came into the classroom.
My _______ is keeping pets. I am _______ in dogs.