一Oh,there’s someone knocking at the door.一 must be that naughty boy.
Do you speak English or French in Canada? _________.But I prefer French.
Is this _______bike? No.________ is over there.
It’s snowing heavily outside. Put on your coat,_________ ,you’ll catch a cold.
What_______useful book it is! Yeah,it tells you how to play ______violin.
-We must act now because time is _____. -Yes. Let’s start.