Millie's brother_____(join)the swimming club last year.
Mr Liu______(bring) some books for everyone this evening.
what ______sandy's mother_______(say)just now?
______(not drop)litter on the ground.
Which would you like_____(choose),the bigger one or the smaller one?
If he ______(not help)me,I won't play with him.
Sandy ______(go) to the zoo if she_____(be)free.