She ought to stop work; she has a headache because she ___________ too long.
| A．has been reading | B．had read | C．is reading | D．read |
All the members of the WTO should follow the ______ of trust and fair(公平) trade.
| A．instructions | B．principles | C．orders | D．rules |
In our class there are 46 students, ______ half wear glasses.
| A．in whom | B．in them | C．of whom | D．of them |
Tom took a taxi to the airport, only ______ his plane high up in the sky.
| A．to find | B．finding | C．being found | D．to have found |
New technologies have made ______ possible to turn out new products faster and at a lower cost.
| A．that | B．this | C．one | D．it |
Not only I but also Jane and Marry ______ tired of having one examination after another.
| A．is | B．are | C．am | D．be |