I think that he must be looking up the information in the library, _____?

[　　]

A．isn't he　　　　B．don't I

C．do you　　　　D．must he

However, in _____ recent years, Niagara Falls have come to be appreciated more for their natural beauty as _____ wonder of nature.

[　　]

A．／; a　　　B．the; the

C．／; the　　D．the; a

Anyway, that evening, _____ I'll tell you more about later, I ended up staying at Rachel's place.

[　　]

A．when　　　　　　B．where

C．what　　　　　　D．which

　　--Is your brother going camping?

　　--He's singed up but he's considering _____.

[　　]

A．not to go　　　　　　B．not going

C．won't go　　　　　　D．not go

_____ was known to them that Bob had broken his promise _____ he would give them a rise.

[　　]

A．What; what　　　B．It; which

C．As; that　　　　 D．It; that

I have been keeping the portrait _____ I can see it every day, as it always reminds me of my childhood in the countryside.

[　　]

A．since　　　B．where

C．as　　　　D．if

Green house phenomena would cause _____ rise in sea levels worldwide and change _____ weather on the earth.

[　　]

A．a; the　　　B．／; the

C．a; ／　　　D．a; a

_____ fashion differs from country to country may reflect the cultural from 0ne aspect.

[　　]

A．What　　　B．That

C．This　　　D．What

Along with the letter was his promise _____ he would visit me this coming Christmas.

[　　]

A．which　　　B．that

C．what　　　 D．whether

Before students leave _____ college, they are advised on their choice of _____ profession.

[　　]

A．／; ／　　　　B．／; the

C．a; the　　　　D．the; the