Max’s legs are too long. When he walks _______ our desk, he often knocks our books _______ the floor.
----Are these your crayons? ------No, they aren’t_______. I think they are_________.
_________ the water was very cold,Wei Qinggang jumped into it to save the little boy.
We can’t put off _________ a plan. Volunteer Day is two days away.
---- You could call him ________. ---- I don’t want to talk about it _________ the phone.
----I called you at nine this morning, but there was no answer . ----Oh, sorry. I ________ with my mother in the supermarket.