—Beijing experienced _____ heaviest snowfall in ____ month of January .
| A．\ ; a | B．a ; the |
| C．the ; the | D． the ; a |
My father made me a promise ___ he would buy me a present if I got a good mark
| A．when | B．which | C．that | D．if |
I have finished translating a large part of the book, but the rest ___ more difficult.
| A．is | B．are | C．was | D．were |
After the new type of rice was introduced, the farmers produced _______ rice this year as last year.
| A．as twice much as | B．twice as much as | C．twice much as | D．twice as much |
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |
_____ we were worried about was _______ they could manage to control the pollution.
| A．That; how | B．That; whether |
| C．What; that | D．What; whether |