________ Mr Brown has got a bad cold，he doesn't want to take the afternoon off.
A. Before B. Because
C. Since D. Although
It's dangerous ________ with the wild animals.
A. of us to play B. of us playing
C. for us playing D. for us to play
Oh，it's very late now! It's time for me to ________ the TV and go to bed.
A. turn on B. turn up
C. turn down D. turn off
The girl fell down and hurt her leg while running，________ she didn't stop.
A. but B. when
C. or D. so
—Mrs Biggs ________the meeting this morning.Do you know why?
—Yes.She went to Shanghai on business the day before yesterday and she won't be back until tomorrow.
A. held B. attended
C. missed D. joined
The maths problem looked________ but David took an hour to solve it.
A. serious B. simple
C. silly D. boring
