_______ it’s difficult to make her dream come true, she never gives up.
| A．Though | B．Unless | C．Because | D．If |
— You should ______ the customers tea before meals.
—But they said they couldn’t wait to eat.
| A．provide | B．afford | C．leave | D．Serve |
Bill doesn’t like the sunglasses because they can’t ______ the sun well.
| A．take out | B．keep out | C．find out | D．look out |
The river smells terrible. People must_____ dirty things into it.
| A．be prevented to throw | B．prevent from throwing |
| C．prevent to throw | D．be prevented from throwing |
—Do you like doing sports , Joe?
—Of course. We can’t keep healthy_____ taking enough exercise.
| A．without | B．by | C．for | D．With |
In China , people are supposed to ______ instead of_____.
| A．shaking hands; bow | B．shaking hands; bowing |
| C．shake hands; bow | D．shake hands; bowing |