Experts believe people can waste less food by shopping only when it is necessary.
| A．why | B．where | C．that | D．what |
Don’t worry. It won’t be long ______we see each other again.
| A．before | B．since | C．until | D．as |
Now that there are still some problems remaining ______, we have to work extra hours tonight.
| A．solved | B．solving | C．to be solved | D．to solve |
It makes no difference to him______ you stay here or go to Hong Kong.
| A．how | B．whether | C．what | D．why |
I think I have great writing ______, but it’s a pity that I don’t have a chance to realize it.
| A．pollution | B．possibility | C．privilege | D．potential |
Everyone has a stage in their life ______ they seem to have trouble in everything.
| A．where | B．when | C．that | D．why |