一、单词拼写。
结合语境，根据首字母或汉语提示用单词的适当形式填空。
1．If everyone o________ the rules of the road, safety is much improved.
2．Their marriage had never been happy and in the end they got a d________.
3．I never knew you were so good at making speeches. Do you have any other hidden t________?
4．Our library s________ will be happy to help if you are unable to find the book you want.
