70．My friends and I may not have time to chat at school．But we can do it on QQ．It’s very　 　　　　to our friendships．

69．Mary becomes 　　　　　　than before because she exercises every day．

68．--How do you know that autumn has arrived?

--One way is that the tree 　　　　　　　become yellow or red．

67．Xiaomeng is a popular 　　　　　　at CCTV Station．

A)从方框内选出单词，用其适当形式填空。每空格限填一词，每词限用一次。

66．Friday is the 　　　　　day of a week．