Ⅰ.单句语法填空
1．Yesterday I was late for school because ____________the traffic jam, which made my teacher very angry.
2．In the early part of ____________ 1800’s, the Americans used natural rubber for the first time.
3．Every minute should be made use of____________(study) our lessons well.
4．It is requested that all members ____________(present) at the party.
