______________, 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 |
The enemy troop suddenly took the small village by surprise _____ a rainy morning.
| A．on | B．at | C．in | D．during |
--What is the model plane look like?
--Well, the wings of the plane are _____ of its body.
| A．more than the length twice | B．twice more than the length |
| C．more than twice the length | D．more twice than the length |
Is this research center _____ the foreign guests visited last week?
| A．that | B．which | C．where | D．the one |
They started early that morning in order that they_____ there before noon.
| A．would get | B．got | C．must get | D．might get |
Mary cares about clothes too much, and she _____ too much money _____ clothes.
| A．spend; in | B．cost; at | C．pays; to | D．spends; on |