根据所给中文意思，完成下列各句。
1. 到他七大学时，他已经学了3 ,000个英语单词。
By the time he went to college,he___________already___________3 ,000 English words.
2. 彼得不知道怎样修自行车。
Peter doesn't know___________ ___________ ___________ ___________bieycles.
3. 我还设有意识到现在有多晚。
I___________ ___________ how late it is now.
4. 他是个聪明的学生，因此他能按时完成这项工作。
He is___________ __________ ___________.student that he can finish the work on timle.
5. 他很令人信服，数百人相信了他的故事。
He was___________convincing___________ ___________ ___________. people believed his story.
