It was quite a long time__________I made it out what had happened.
| A．after | B．before | C．when | D．since |
.
— Which of these electronic watches do you like?
— ______of them. They are expensive and of little use.
| A．None | B．All | C．Both | D．Either |
.
It is an established fact that factory workers work better, harder, and have _____ accidents when their machines are painted orange rather than black or gray.
| A．fewer | B．few | C．more | D．less |
.
Education knows no limits. It _____ take place anywhere, whether in a kitchen or in the job.
| A．should | B．can | C．need | D．must |
.
I felt it rather inappropriate to turn up at the graduation ceremony _____ jeans and a T-shirt.
| A．in | B．on | C．by | D．with |
.
Don’t leave the chocolates _______Cathy can get them. They are not good for teeth.
| A．whether | B．in which | C．where | D．unless |