______________, 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 |
No one imagined that the apparently _____ businessman was really a criminal.
| A．respectful | B．respectable | C．respective | D．respected |
Mary had taken _____ to see that her guests had everything that they could possibly want.
| A．efforts | B．pains | C．attempts | D．try |
Jack almost fell off the cliff, but managed to _____ until help came.
| A．keep on | B．catch on | C．count on | D．hang on |
Don't _____ the news to the public until we give you the go-ahead (许可，准许).
| A．release | B．print | C．relieve | D．publish |
His _____of the aeroplane was correct in every detail and could really fly.
| A．shape | B．pattern | C．design | D．model |