一、单句语法填空。
阅读下面每句话填入一个词或者所给单词的正确形式。
1．I think they should equip their office ________ some new computers for some research work.
2．I was walking on the street ________ I heard a voice calling me.
3．I was ________(wave) my hand madly but he never once looked in my direction.
