Love your parents __________ they are alive. Don't wait until it is too late.( )
A.whileB.thoughC.becauseD.unless
单词辨音( )
A.gameB.gentlemanC.flagD.together
A.purpleB.returnC.surpriseD.hurt
A.relaxB.sevenC.websiteD.tell
A.actB.bagC.factD.make
﹣﹣﹣________times have you visited Gansu Science Museum?
﹣﹣﹣Only once.( )
A.How oftenB.How manyC.How longD.How soon