In much of the animal world, night is the time ______ for sleep—pure and simple.
| A．set aside | B．set down | C．set off | D．set up |
— She suggested the number of cars should be limited to stop air pollution.
—_______, the idea is not very practical.
| A．Sounds good as it | B．As it sounds good |
| C．As good it sounds | D．Good as it sounds |
—Is there any particular soup you would like to have?
—_______ you select is all right with me.
| A．Whatever | B．Anything |
| C．No matter what | D．Whichever |
With the aim of getting high marks, most Chinese students were ________ lacking creativity.
| A．picked up | B．taken up |
| C．brought up | D．built up |
__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once |
| C．Though | D．Unless |
—Tony, you must have noticed the student who broke the window.
—I’m sorry. I _______ attentively.
| A．studied | B．was studying |
| C．am studying | D．would study |