A small car is big enough for a family of three ____ you need more space for baggage.
| A．once | B．because | C．if | D．unless |
33. Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.
| A．improve | B．to improving | C．improving | D．to improve |
32. Staying in a different country, just watch others to see _____ they act to decide what the best to say is.
| A．What | B．Why | C．how | D．When |
31. The cheering went on for quite some time _____ it died down and people took their seats again.
| A．Before | B．Since | C．As | D．When |
30. —I _________ his telephone number.
—I have his number, but I _________ to bring my phone book.”
| A．forget, forget | B．forgot, forgot | C．forgot, forget | D．forget, forgot |
29. He was busy preparing a speech , only _______ once in a while to rise from the table for a tea .
| A．stopping | B．to stop | C．to have stopped | D．having stopped |