【答案】

【1】Mike used to be a top student, but he has been behind others since he lost himself in computer games.

【2】Keep in touch with your friends, and you will get along better and better with them.

【3】I don’t think the TV play is not as interesting as I expected．

【4】That concert was so wonderful that it was well worth waiting for.

【5】She has a real gift for music and has tried out for "Voice of China"．

【6】More action should be taken to pay attention to every detail .

【解析】

【1】since自从，since+句子，主句用现在完成时。be behind落后。故答案为：has been behind others since。

【2】get along better and better with sb与某人相处的越来越融洽。这里句式： 祈使句and+陈述句，陈述句可以用一般将来时，故答案为：and you will get along better and better with them 。

【3】the TV play电视剧； not as interesting as 前者不如后者；根据I don’t think可知，预期是发生在过去。故答案为：the TV play is not as interesting as I expected 。

【4】so+形容词或副词+that+句子,be worth  doing sth 值得做某事。故答案为：was so wonderful that it was well worth waiting for 。

【5】has a real gift for对某事有天赋；try out for参加选拔。根据前面的has用的是一般现在时及汉语已经参加《中国好声音》的选拔，所以应该用现在完成时。故答案为：a real gift for music and has tried out for 。

【6】take action采取措施；pay attention to注意。这里是含有情态动词的被动语态：情态动词+be+done，故答案为：should be taken to pay attention to every detail 。