【題目】 Experiments _______ that children can be instructed in swimming at a very early age, as early as about two months.
A.are provingB.will be provedC.are provedD.have proved
【題目】Yang Liwei is the 438th person _______ in space.
A.to travelB.travellingC.having travelledD.travelled
【題目】Because of the progress he ______ in his performance, he was soon promoted to project manager.
A.had madeB.had been madeC.makesD.has been making
【題目】I walked in our garden, where Tom and Jim _______ a big sign onto one of the trees.
A.were tiedB.are tyingC.have tiedD.were tying
【題目】 The man was so surprised at _______ that he did not try to escape or defend himself.
A.discoveredB.discoveringC.to be discoveredD.being discovered
【題目】She tapped me on _______ shoulder and teased me _______ my hair.
A.the; aboutB.my; forC.the; onD.my; with
【題目】At our factory there are a few machines similar to _______ described in this magazine.
【題目】It is estimated that the number of tourists who travel abroad ______ in the past decade.
A.have doubledB.have been double
C.have been doubledD.has doubled
【題目】Mary worked here as a _______ secretary and ended up getting a full-time job with the company.