___we admit that there are still some problems about NMET, we don’t mean that it’s of no use.
| A．While | B．Until | C．As | D．Unless |
Many people believe we are heading for environmental disaster _____ we basically change the way we live.
| A．but | B．although | C．unless | D．once |
—Who _____ it be that is knocking at the door?
—It ______be father, but I’m not sure.
| A．can; may | B．may; can | C．may; must | D．need; should |
You can't imagine _____when they received these nice Christmas presents.
| A．how they were excited | B．how excited they were |
| C．how excited were they | D．they were how excited |
The meeting was of _____, and the information he offered at the meeting was_____.
| A．important; valuable | B．great important; of valuable |
| C．great importance; valuable | D．very important; of valuable |
The reason_______ his coming to China was _____ he wanted to study Chinese medicine.
| A．for, that | B．why, that | C．why, because | D．for, because |