1．informal adj.非正式的
2．lack v．&n.缺乏，缺少
3．opportunity n．机会
4．prize n．奖品，奖金
5．tidy v．使……整洁，整理
6．favour n．恩惠，照顾
7．reply n．回答，答复，回信
8．modest adj.谦虚的，谦逊的
9．purpose n．目的
[语境运用] 用所给词的适当形式填空。
1．I sent my invitation to a wrong address by mistake. Otherwise, Mr. Green would have replied (reply) to me.
2．My mother is being unreasonable; she doesn't allow me to go out until I have the room tidied (tidy) up.
3．Either you or the headmaster is to hand out the prizes (prize) to these gifted students at the meeting.
