AIDS is said________the biggest challenge to both men and women in that area over the past few years.
—Hi, Tommy, got a minute? —________, what's on your mind?
A number of questions __________at the meeting held yesterday.
—What are you going to do this afternoon? —I am going to the cinema with some friends. The film ____ quite early, so we ____ to the book-store after that.
He commanded that the student _____the classroom before he returned. A didn't leave B wouldn't leave C not leave D can’t leave
E-mail English is a new kind of written English that ______to save time. A be being used B was being used C being used D is being used