Lesson21-30练习题一.用所给词的适当形式填空。1. Which _(box) are big?2. The _(knife) are sharp.3.Is this _(Peter) hat?4_(this) ice creams are nice.5.Come and meet our _(employ).6.There are some _(magazine) on the table.7.They are _(man) teachers.8.Are there _(some) shoes on the floor?9._(who) armchairs are near the table?10.Mrs Smiths _(live) room is large.二.单词拼写。