At the meeting they discussed three different ______ to the study of mathematics.
| A．approaches | B．means | C．methods | D．ways |
A model or an experiment in a science class can help us see things which wouldremain hidden．
| A．therefore | B．yet | C．otherwise | D．still |
She must have ranked her birthday presents in order of_because the top one is her favorite．
| A．value | B．time | C．interest | D．preference |
We have hurried all the way to the airport - the flight was called off because of the foggy weather．
| A．mustn’t | B．couldn't | C．needn’t | D．wouldn’t |
the room, the nurse found the tape recorder．
| A．Entering; stealing | B．Entering; gone |
| C．To have entered; being stolen | D．Having entered; to be stolen |
—What happened to the young trees we planted last week?
—The trees _well, but I_them．
| A．might grow; hadn't watered | B．needn't have grown; didn't water |
| C．would have grown; didn't water | D．would grow; hadn't watered |