.The teacher demanded that our examination paper _____handed in at once .
A be B must be C would be D had to be
Once plastic pollution ______in most public areas, it is hard______.
| A．rises; dealing with | B．arises; to be dealt with |
| C．raises; dealt with | D．arises; to deal with |
Anyway, we’re here now, so let’s _______ some serious work.
| A．come up with | B．get down to |
| C．do away with | D．live up to |
How long do you think it will be ______ another e-commerce giant comes out to exceed Alibaba?
| A．when | B．before | C．since | D．until |
Life did not _____ the way we thought it would, but we still need to have a positive attitude toward it.
| A．get along | B．turn out |
| C．go on | D．keep up |
We got up early for fear that we ______ miss the early bus.
| A．could | B．should | C．will | D．can |