题目内容：

请根据语境用括号内单词的正确形式或根据汉语意思填空，每空一词。

1.Hundreds of _______________(请柬) are being sent out this week.

2.The salesgirl pretended not to hear me and went on ______（闲谈）with a lady in blue .

3.Had he anything to say in ___________（explain） of his behaviour?

4.If the exercise causes ________(comfort), stop immediately.

5.She has been fully __________(occupy) with work recently.