We __________ that the two substances have combined to form the new material.
| A．suggest | B．conclude | C．concentrate | D．include |
一I’m sorry! I would have taken him to hospital if I had known he was seriously ill.
一But ______ .
| A．you didn’t | B．you hadn’t | C．he wasn’t | D．you aren’t |
The question that puzzled them is ____ they can get rid of the air pollution in the area.
| A．how is it that | B．that how | C．that it is how | D．how it is that |
It is reported that many a new house ____ at present in the disaster area in Gansu Province.
| A．was being built | B．were being built | C．is being built | D．are being built |
_____ on a clear day, far from the city crowds, the mountains gave him a sense of peace.
| A．If walking | B．While walking | C．Walking | D．When he was walking |
They in Holland for ten years. Now they have settled down in Paris.
| A．lived | B．have lived | C．had lived | D．were living |