The world is changing fast. I strongly believe that one will easily fall behind he keeps on learning.
| A．unless | B．if | C．when | D．as |
I don’t think _____ possible to master a foreign language without much memory work.
| A．this | B．it | C．which | D．that |
--- Did you have a good time in the US during the Golden Week Holiday?
--- ______ . Due to the temporary shutdown, a lot of national parks were closed.
| A．Not really | B．You’re right |
| C．Oh, great! | D．Yeah, why not? |
You will never gain success ______ you are fully devoted to your work.
| A．when | B．because |
| C．unless | D．after |
The boys, who _____ their homework, were allowed to play basketball on the playground.
| A．will finish | B．finish |
| C．have finished | D．had finished |
—People often don't appreciate what they have, do they?
—No, _________ they lose it.
| A．if | B．after | C．until | D．when |