We have been expecting Rio 2016 Olympics_______ the Olympic flame(圣火) was lit.( )
A.ifB.unlessC.sinceD.though
In Switzerland,things like glass and plastic into different groups and then recycled( )
A.separateB.separated
C.are separatedD.is separated
Watch out,Peter! is a little boy playing ahead on the road.( )
A.ItB.ThisC.ThatD.There
My grandma's hobby is cooking watching TV,It's square dancing ( )
A.not only;but alsoB.neither;nor
C.both;andD.either;or
It seems that El Nino some disasters in the world in the past few months ( )
A.has causedB.is causingC.will causeD.caused
do you go to Mrs Rainbow's colour therapy?
Once every two weeks.( )
A.How oftenB.How soonC.How longD.How far