( ) __________are good friends.
Are you behind the tree?______ A.Yes,I'm. B.No,I'm. C.Yes,I am.
What grade are you in? I'm in______.A.Grade 4 B.grade 4 C.Class4
Let me______you.A.help B.to help C.helping
Time______lunch.A.to B.for C.of
Welcome_____our school.A.to B.on C.不填