Giúp e với ạ từ 1 đến 16

1. When we arrived at the restaurant, the others A. left B. have left C. had left D. are leaving 2. After he.. ...his English course, he went to England to continue his study A. has finish B. had finished C. was finished D. would finish 3. How.. .since we .college? C. have you been- ha ...