This software______ protect computers from being attacked by viruses and it took my brother a long time to ______ how to start it.
| A．is intended for; come out |
| B．intends to ; turn out |
| C．is mean to; figure out |
| D．is meant for; work out |
Mary and her friends paid_____visit to _______Summer Palace yesterday.
| A．the; / | B．a; the | C．a; / | D．the; a |
It was back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
is believed that improvement in health care will lead to a stronger , more prosperous economy .
| A．As | B．That | C．This | D．It |
----May I smoke here ?
-----If you , choose a seat in the smoking section .
| A．should | B．could | C．may | D．must |
I like getting up very early in summer. The morning air is so good .
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |