--- What ________ the number of the students in your school? --- About two thousand. A number of them __________ from England.
Tom is unaware of his mistake. A.is sure about B. unknown C. doesn’t realize
He is better at playing badminton. A.is good at B. does better in C. does best in
Kate and I _______ doing ________ homework now.
Do you have __________ to do?
--Tom has been to Beijing before. --________________.