_____ makes a new invention such a wonderful thing is ____ it allows us to do something ____ we could not do before.
| A．What; what; what | B．That; that; \ | C．What; that; \ | D．That; what; that |
We can’t take part in the competition ________ we get our student card.
| A．before | B．if | C．While | D．as |
It was announced that only when the examination papers were handed in ________to go out of the classroom．
| A．the students would be permitted | B．had the students been permitted |
| C．would the students be permitted | D．the students had been permitted |
As a result of the heavy snow，two-thirds of the buildings in the area A. need to repair B.needs to repair C.needs repairing D need repairing.
—It’s only ten minutes’ walk; I could have got there on foot.
— Yes. A taxi _______ not at all necessary.
| A．was | B．had been | C．has been | D．is |
It was about 5 o’clock in the afternoon _______ they had their supper.
| A．that | B．what | C．before | D．when |