根据下列句子内容补全下列单词。

1．Don’t f____________ to do your homework．

2．Can you t____________ this word？I can’t understand it．

3．Have you ever seen him b____________ ?No，never．

4．Because it’s a new term，I want to give you some a____________．

5．It’s not always necessary to look up the words in the dictionary，sometimes we need to g_____．