The design soon ________ in Chinese colleges．Can it be called a fashion?

put off

gave off

took off

kept off

This company was the first ________ portable radios as well as cassette tape recorders in the world．

producing

to produce

having produced

produced

I don’t think it’s wise of you to ________ your greater knowledge in front of the director, for it may offend him．

show up

show out

show in

show off

－You look tired．

－This room ________ for many years．I ________ it all day．

wasn’t cleaned; have tidied

hasn’t been cleaned; have been tidying

wasn’t cleaned; have been tidying

hasn’t been cleaned; have tidied

Scientists are convinced ________ the positive effect of laughter ________ physical and mental health．

of; at

by; in

of; on

on; at

“Things ________ never come again,”I couldn’t help talking to myself．

lost

losing

to lose

have lost

－I’m sorry, but I didn’t mean ________ out your secret．

－But you know, letting out one’s secret means ________ one’s feeling．

to let; to hurt

letting; hurting

to let; hurting

letting; to hurt

She was such a stubborn person that she would die ________ she would admit she was wrong．

when

until

after

before

It’s announced in the local paper that Diana has got engaged ________ Charles, who fell in love ________ first sight．

to; at

with; at

to; in

with; for

Unmarried mothers have become one of the social ________ that increasingly come to widespread public attention, ________ Professor Johnson puts it．

realities; as

phenomenon; which

realities; which

phenomena; as