①How many children are there? ____            A. It's forty yuan.

②What are they doing? ____                          B. Playing basketball.

③How much is the basketball? ____               C. Every afternoon.

④How often do they play basketball?____     D. Tired and exhausted.

⑤How do they feel now? ____                        E. There are nine.

⑥Where do they play basketball? ____           F. In the gym.

At least 300million people are using QQ            by Ma Huateng to chat or line.

责任的公民，首先应该是一个对自己负责的人。这是因为 （）

根据句意，在答题纸标有题号的横线上，写出括号内所给单词的适当形式。每空只写一词。