根据句意及所给汉语意思写出所缺单词。
I usually make ___ ( 错误 ) in grammar.
He can’t____ ( 负担得起 ) to pay for his child’s education.
I can’t go to the party, because I’ll have a big ____ ( 考试)tomorrow.
We were very happy , when we were having a _____ ( 野餐 ) last week.
There are many _____ ( 会员 )waiting for our director in the hall.