33．— We should recycle everything we can．
— Absolutely．These may seem little things，but they’re not__________it comes to saving the
environment．
| A．since | B．when | C．while | D．As |
I ________ asleep because it took me a long time to realize that the telephone was ringing.
| A．could fall | B．need have fallen | C．must have fallen | D．may fall |
A few days in this country, ________ you will be attracted by its impressive culture.
| A．but | B．or | C．so | D．and |
_________ obviously made no difference whether I was there to look after things or not.
| A．It | B．That | C．What | D．This |
Let’s have a talk over this matter this afternoon, or __________ it is convenient to you.
| A．wherever | B．whichever | C．however | D．whenever |
Many of us love traveling, but lack of financial _________ often holds us back from seeing the world.
| A．destination | B．breakthrough | C．support | D．request |