_________ he steps on the stage, he will sing the song which made
him famous two years ago.
| A．By the time | B．Each time |
| C．The first time | D．Many times |
--- What do you think of my suggestion?
--- I’m sorry. Er… I _______ about something else.
| A．thought | B．am thinking | C．was thinking | D．had thought |
The newly-married couple quarreled so much that they reached the point _______ they had to separate from each other.
| A．when | B．where | C．which | D．that |
He was thinking about the problem when an apple fell off the tree, _______ him right on the head.
| A．hit | B．having hit | C．hitting | D．and hitting |
I’ve got so many problems _______ today that I’m afraid I won’t have time to have lunch.
| A．to handle | B．handle | C．handling | D．handled |
--- Will you take up teaching as a career after graduation?
--- Hard to say. I _______ go abroad for higher education instead.
| A．should | B．must | C．might | D．shall |