题目内容：

根据句意,写出括号内所给单词的适当形式。

1.People didn’t know much about the moon ________ (century) ago.

2.Many people _______________ (reply) to the actor’s words on the Internet last week.

3.It’s true that we won the first prize during the _______________ (follow) match.

4.We all felt it _______________ (excite) to visit Changzhou Joyland.

5.Please remember to keep the door ______________ (lock) when you leave the office.