25. Some pre-school children go to a day-care centre,_________they learn simple games and songs.
| A．then | B．there | C．which | D．Where |
Look before you leap! You have to ______the costs of the new system against the benefits it will bring.
| A．weigh | B．match | C．defend | D．Fight |
If you have a job, ________ yourself to it and finally you’ll succeed.
| A．do devote | B．don’t devote | C．devoting | D．not devoting |
_________, so he is afraid of dogs .
| A．Having been bitten twice | B．Bitten twice |
| C．After he has been bitten twice | D．He has been bitten twice |
Asiswidelyacknowledged,playingoutsidehelpschildrenlearnthroughcuriosity, which , _ __, promotescreativity.
| A．inbrief | B．inturn | C．inconclusion | D．inreturn |
--Life____beveryhardforpeoplelivinginthenorthofCanadaasitisvery
coldthereinwinter.
—Yes,theweatherthere_____beaslowas60℃belowzero.
| A．must;can | B．shall;must | C．will;should | D．hasto;can |