—The air pollution is terrible.
— It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．When |
Many people believe _______ robots will do most of our housework in the future.
| A．that | B．if | C．why | D．how |
Nick _______a job, but to our surprise, he didn’t take it.
| A．is offered | B．offered | C．was offered | D．has offered |
—Have you ever been to Shanghai, Mary?
—Yes. I ______ there for three days with my parents last year.
| A．have gone | B．have been | C．went | D．was |
The prices of new houses in our city have been ________than before, but they ______ well at present.
| A．higher, still sell | B．lower, are not still sold |
| C．higher, don’t sell | D．cheaper, are not still sold |
—We’ll have ________ holiday next month. Will you go home?
—No. If I go home, I’ll have to take________ ride.
| A．a one-week; seven days | B．an one-week; a seven day’s |
| C．a one-week; a seven days’ | D．one-week’s ; a seven days’ |