－Is Jack on duty today?

－It ________ be him．It's his turn tomorrow．

A．mustn't

B．won't

C．can't

D．needn't

The workers will go on strike if the demands they ________ put forward are turned down．

A．could

B．would

C．/

D．had

We ________ have proved great adventurers, but we have done the greatest march ever made in the past 10 years．

A．needn't

B．may not

C．shouldn't

D．mustn't

The owner of the cinema needed to make a lot of improvements and employ more people to keep it running ________ meant spending tens of thousands of pounds．

A．who

B．that

C．as

D．which

The building around the corner caught fire last night．The police are now ________ the matter．

A．seeing through

B．working out

C．looking into

D．watching over

The weather turned out to be very good, ________ was more than we could expect．

A．what

B．which

C．that

D．it

Some people complain(抱怨)that it usually ________ too long to fill in the forms．

A．spends

B．costs

C．takes

D．tries

His theory ________ to be true．

A．proved

B．was proved

C．is proved

D．has been proved

Mr Smith has bought a little house in the country, around ________ some green trees．

A．which is

B．it is

C．which are

D．them are

Not far from the school there was a garden, ________ owner seated in it playing chess with his little grandson every afternoon．

A．its

B．whose

C．which

D．that