The new policy allows a couple to have a second birth____either is an only child.
| A．if only | B．on condition that |
| C．unless | D．until |
—Shall we go out for a walk?
—I'm afraid not．We can't go out ___ our work is being done．
| A．before | B．until | C．as | D．after |
___ we have overlooked, however, is that there is no one answer to this question．
| A．Which | B．That | C．Where | D．What |
—What a shame!
—Yes, I ____ his not doing it, but in vain．
| A．was suggesting | B．will suggest |
| C．would suggest | D．had suggested |
Maybe you could be an inventor—maybe even good enough to _____ the next iPhone or the new medicine for cancer．
| A．put up with | B．keep up with | C．catch up with | D．come up with |
The child walked quietly to the bird．_____ into the forest before he was about to catch it．
| A．Flew it away | B．Away it flew | C．Flew away it | D．Away flew it |