I have waited for her since _____.
| A．two hours ago | B．two hours before |
| C．two hours | D．two hour’s time |
By the time these books were published, he _____ addicted to them.
| A．had become | B．becomes | C．has become | D．became |
I’m fine — I just felt a bit sleepy and tired, that was ________ I went to bed so early."
| A．because | B．when | C．that | D．why |
—why, Jack, you look so tired!
—Well, I _____the house and I must finish the work tomor
row.
| A．was painting | B．will be painting | C．have painted | D．have been painting |
—I’ve told Nancy many times about the meeting, but she still forget it!
—I understand. Actually, anyone ______ be very forgetful at times.
| A．must | B．should | C．ought to | D．can |
Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |