请帮忙指出下列题目所考察的高中英语语法点,
1.—Doyouthinkhecangetthefirstprizeforjumping?
—Impossiblenow.Hetodoso,buthehasjusthurthisleg.
A.hasexpectedB.isexpectedC.wouldexpectD.wasexpected
2.Notuntilthemaninblacktookoffhisdarkglassesthathewasthefamousfilmstar.
A.didIrealizeB.IrealizedC.wasIrealizedD.Ihaverealized
3.Spaceexplorationbeganinthe1960s,andsincethenaboutfivehundredpeopleintospace.
A.havetraveledB.traveledC.hadtraveledD.aretraveling
4.—Excuseme,butcouldyoupleasetellmethewaytothegasstationaroundhere?
—Sorry.Thereisn’tgasstationnearby,I'mafraid.
A.oneB.不填C.theD.a