It was not until 1920 ________ regular radio broadcasts began．

A．while

B．which

C．that

D．since

Tom kept quiet about the accident ________ lose his job．

A．so not as to

B．so as not to

C．so as to not

D．not so as to

What a great ________ it is to work here!Everybody is so kind to me．

A．surprise

B．job

C．fun

D．pleasure

We are certain that everything will go well as ________．

A．to be planned

B．planned

C．being planned

D．having been planned

It was in the lab ________ was taken charge of by professor Black ________ they did the experiment．

A．that; where

B．which; that

C．whom; that

D．which; where

Why didn't you tell me there was no meeting today?I ________ all the way here through the heavy snow．

A．needn't have driven

B．can't have driven

C．shouldn't have driven

D．didn't need to drive

I wonder how he ________ that to his parents．

A．dare to say

B．dared say

C．dares to say

D．not dare say

－Oh!What great progress you've made!

－________．

A．It's all right

B．That's all right．Keep it up

C．Thank you!But I still have a long way to go

D．Don't mention it．It's far from enough

It's reported that we have produced ________ this year as we did last year．

A．as much cotton twice

B．as twice much cotton

C．twice as much cotton

D．much as cotton twice

－I always look out when crossing the street．

－You are right．You cannot be too ________．

A．nervous

B．careful

C．worried

D．careless