________areBob’sgrandparentsandtheyareverynice.

There is _______ sheep on the farm.

_____ to the United States? –No, never. But I went to Canada a few years ago.

______a teacher, John thinks that his duty is to help the students to become better learners.[ ]

hey, Alice. You___ on the phone a moment ago. But you weren’t here and I took a message for you. Oh? I was in the library.