---- How did you know the surprising news?
---- I happened ____ the event then.
| A．to cover | B．to be covering | C．covering | D．to have covered |
In fifteen terrible seconds a large city .
| A．lied in ruin | B．lay in ruin | C．lied in ruins | D．lay in ruins |
---My family usually goes skating for vacation. I like skating, but I want to try something different this year.
----_______.
| A．Let’s go! | B．Cheer up! | C．Like what? | D．Take care! |
Not easy as the problem of pollution is____, no one should just stop trying.
| A．to solve | B．to be solve | C．solving | D．being solved |
Let us suppose that we _____him about it, what would have happened?
| A．had not told | B．did not tell | C．will not tell | D．don’t tell |
There’s no point trying to ___ with her because she will never change her mind.
| A．agree | B．compete | C．compare | D．reason |