I just don’t understand ______ that leads to so many teenagers becoming addicted to playing computer games.
| A．why it does | B．what it does | C．what it is | D．why it is |
____ the rain has stopped, let’s start again.
| A．Because of | B．Now that | C．For | D．That |
I went to bed very late that night, _____, early the next morning.
| A．or rather | B．at least | C．at most | D．in a word |
—How long did you do your homework? —______.
| A．Before it struck 10 | B．Since supper time |
| C．So long as I stayed up | D．Until 10 o’clock |
My mother bought me a new pair of boots on my birthday _____she had promised.
| A．which | B．what | C．with | D．as |
. We liked the oil painting better ___ we looked at it.
| A．as | B．while | C．the moment | D．the more |