I think it is because man can't be________ strong.

[　　]

This is the best way I could think of ________ the students ________ the rules.

[　　]

The scientist ________ all night long

[　　]

A． went on making the experiment

B． went on to make the experiment

C． kept to make the experiment

D． kept to make the experiment

He is a________ student

[　　]

Although our life is _______, there is no limit ________ serving the people.

[　　]

--You forgot your purse when you went out.

--Good heavens, _______.

[　　]

--Who do you think _______ when she went to the station?

--Perhaps Lily.

[　　]

_______ straight down this road, you will find the bank at the end.

[　　]

I cycled in front of him, ________ my bicycle and laid it down on the road in front of his car so that he couldn't drive off.

[　　]

--Since you like the bike so much, why not buy it?

--Well, now I haven't enough money to buy _______ bike.

[　　]

A. a so expensive

B. that expensive a

C. that an expensive

D. so an expensive