It ________ that space is limitless．

A．believes

B．was generally believed

C．believed

D．is generally believed

After a whole day of hard work, all ________ was a nice meal and a good rest．

A．what he wanted

B．which he wanted

C．the things he wanted

D．that he wanted

Scientists have reached the conclusion ________ the temperature on the earth is getting higher and higher．

A．when

B．but

C．that

D．for that

________ this material can be used in our factory has not been studied yet．

A．Which

B．What

C．That

D．Whether

It is possible ________ he misunderstood ________ I said．

A．that, that

B．what, what

C．what, that

D．that, what

________ still needs to be discussed．

A．How is the plan to be carried out

B．How the plan is to be carried out

C．Why is the plan carried out

D．Why the plan carried out

________ a pity you missed the lecture made by Professor Qian．

A．That's

B．It's

C．There's

D．What's

________ will take part in the physics contest will be announced at tomorrow's meeting．

A．Who

B．Whom

C．Which

D．That

He is satisfied with ________ his son has achieved．

A．all what

B．that

C．all that

D．which

I met her ________ in a crowded bus．

A．with an accident

B．by accident

C．in accident

D．by an accident