--- Hi Mike, are you busy now?
--- Not really. I _____ my work, and I’m going to see a movie online.
| A．did | B．have been doing | C．had done | D．have done |
.
To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.
| A．has invented | B．had invented | C．invents | D．is inventing |
.
— 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 |