These problems，______ will seriously affect the growth of teenagers and even the nation's future.
| A．not if solved properly |
| B．if solved properly |
| C．not if properly solved |
| D．if not solved properly |
The best moment for the football star was ______ he scored the winning goal.
| A．when | B．where | C．how | D．why |
The play ______ next month aims mainly to reflect the local culture.
| A．produced | B．to be produced |
| C．being produced | D．having been produced |
--- I am really struck by your spoken English. You speak so fluently. Have you been abroad?
--- Yes. I _____ in London for two years.
| A．have stayed | B．had stayed |
| C．stayed | D．have been staying |
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? |