从方框里选择合适的词，根据句子的意思，用其适当形式填空。

possible     refuse      use       worry       her

小题1:David was badly hurt in the accident, so we were very _______ about him.
小题2:Lily’s family can’t afford her education. So she always teaches _______.
小题3:They invited me to the party, but I had to________ because I was very busy.
小题4:It is bad for our eyes to watch TV too much . I think it’s ________ true.
小题5:Did she ________to have long hair when she was in Grade Seven?