Although we met with many difficulties, we got back home ________.
| A．safely and sound | B．safe and sound |
| C．safe and soundly | D．safely and soundly |
______ herself in looking after the newly-born twins, she had to sacrifice her career to stay with her kids.
| A．Occupied | B．Being occupied |
| C．Having been occupied | D．Occupying |
--- What is your strongest memory of the bombing attack?
--- If I ______ rightly, we were about to approach the finish line when a big bang struck my ears.
| A．will remember | B．had remembered | C．remember | D．remembered |
More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
As for friendship, remember that no time is ever wasted _______ makes two people better friends.
| A．what | B．that | C．when | D．as |
The golden rule is not to waste time waiting for opportunity. Begin, ______ opportunity will find you.
| A．and | B．when | C．so | D．because |