________, I think, and the problems could be settled.
| A．If you double your efforts |
| B．So long as you keep up your spirits |
| C．Making greater efforts |
| D．A bit more efforts |
Education is a lifelong process, ____ starting long before the start of schooling．
| A．which | B．that | C．it | D．one |
—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 |