Parents，of course，will do everything they could to________their children from harm.
| A．defend | B．convince |
| C．overcome | D．reduce |
In the past decades, sea ice ______ in the Arctic as a result of global warming.
| A．had melted | B．has been melting | C．melted | D．is melting |
I know you don’t like her, but try not to make it so ______.
| A．curious | B．obvious | C．various | D．previous |
Schools in the north tend to be better equipped, ______ those in the south are relatively poor.
| A．as | B．unless | C．when | D．while |
— Excuse me, can you spare me a few minutes?
—Sorry, I haven’t ______ time to talk to you just now. I have to leave early to catch ______ 4:30 train.
| A．/; / | B．the; the | C．a; the | D．the; / |
There is never enough time to do everything, ______ there is always enough time to do the most important thing.
| A．and | B．but | C．or | D．so |