五、 同义句转换(5小题, 每小题2分, 计10分):

　　46.It took me fifteen minutes to finish the e-mail.

　　_________ spent _________ quarter in _________ the e-mail.

　　47.I spent 80 yuan on the coat.

　　I _________ 80 yuan _________ the coat.

　　48.It took me three hours to do the homework.

　　I _________ three hours _________ the homework.

　　49.She was so weak that she couldn't take care of herself.

　　She was _________ weak _________ take care of herself.

　　50.He went to Beijing at the age of 14.

　　He went to Beijing when he _________ _________.