—________do you help at the Food Bank, Lily?
—Once a month.
A.How often B.How long C.How many D.How much
—Adam, where are the other members of our team?
—They________ research in the library now. Let’s go and join them.
A.do B.did C.will do D.are doing
Tilly Smith ________ her geography lesson to save many lives in a tsunami in 2004.
A.uses B.is using C.used D.was using
Jim________with me on the phone at 6:00 pm yesterday.
A.talks B.talked C.is talking D.was talking
Tom usually________to school early but his sister doesn’t.
A.go B.goes C.went D.will go
—Scientists still ________ explain exactly why people dream.
—That’s right. They might understand it all someday, but they aren’t sure now.
A.shouldn’t B.mustn’t C.needn’t D.can’t
