－Must I turn off the gas after cooking?

－Of course．You can never be ________ careful with that．

A．enough

B．too

C．so

D．very

It is reported that the United States uses ________ energy as the whole of Europe．

A．as twice

B．twice much

C．twice much as

D．twice as much

At a rough estimate, Nigeria is ________ Great Britain．

A．three times the size as

B．the size three times of

C．three times as the size of

D．three times the size of

You see, the accident happened like ________：The red car hit the bus and made all the traffic stop．

A．that

B．this

C．it

D．one

The boy wrote ________ last week．

A．a two-thousand-words article

B．a two thousand words article

C．a two-thousand-word article

D．two two-thousands-words articles

________ used to be thought that the earth was square．

A．He

B．What

C．It

D．That

Tom's and John's ________ came to London last week．

A．father-in-law

B．fathers-in-law

C．fathers-in-laws

D．father-in-laws

The rich ________ not always happy．

A．are

B．is

C．has

D．have

“All ________ present and all ________ going on well．”our monitor said．

A．is; is

B．are; are

C．is; are

D．are; is

He is the only one of the students who ________ elected．

A．are

B．have

C．has

D．is