Ⅰ.单句语法填空
1．In China a great ________ graduates go abroad to have a further study every year.
2．The man followed by us stopped to look as if ________ (see)whether he was going in the right direction.
3．________ (bury) in thought, I didn't notice what was happening.
4．When she heard the funny news, she burst into ________ (laugh)．
