After several days of social activities, I decided to _ on my research on the human behaviors.
| A．fix | B．settle | C．set | D．concentrate |
I first met your sister ten years ago, when she ____at a supermarket as a salesgirl.
| A．has worked | B．had worked | C．was working | D．had been working |
The boy is working harder than ever, hoping to ___the time he has wasted playing online games.
| A．take up | B．make up | C．bring up | D．call up |
We ___have hurried all the way to the airport—the flight was called off because of the foggy weather.
| A．mustn’t | B．couldn’t | C．needn’t | D．wouldn’t |
The web is fantastic at many things, e-mail, e-commerce, for example. But _____ your name is Amazon Or Google, making money has proved hard.
| A．if | B．although | C．unless | D．as |
Don’t expect to pass the driving test at your first attempt.____, you’ve been learning to drive for only a couple of days.
| A．As a result | B．After all | C．In other words | D．In general |