题目内容：

根据句意及首字母填写单词。

1.Do you know the c____ answer to the math problem?

2.He was so t_____ that he drank plenty of water in one breath.

3.The man is good at playing Chinese c______

4.Many foreign t______ come to China every year.

5.The Red Army s________ in arriving in Gansu Province in 1936.