All passengers ______ go through safety check before they take the underground．
A.can B.may C.must D.shall
___________the old watch doesn't work well, my grandpa still keeps it as a treasure.
A.If B.When C.Because D.Although
Lucy___________the piano since she was six years old.
A.played B.plays C.has played D.is playing
—___________does it take to get to the nearest bank?
—About half an hour on foot.
A.How long B.How much C.How soon D.How often
Students spent a long time___________for the coming school-leavers party
A.prepare B.prepared C.to prepare D.preparing
Sally visited our family yesterday and had a good time with___________.
A.her B.you C.us D.them
