( )1.The students are clever. They have no problems _____ out the math problem.
A.work B.working C.works D.to work
( )2.—Do you know where Tom is?
—Yes. He _____ his hometown.
A.went to B.goes to C.has gone to D.has been to
( )3.There are many kinds of bikes here. She can’t decide _____.
A.where to buy B.which to buy C.how to go there D.when to go there
( )4._____ you do, I will be on your side.
A.Whenever B.Whatever C.However D.Wherever