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dear peter,
thanks very much on inviting me to your birthday 1._______
party on SUNday. i’d like very much to go but 2._______
i had an examination on monday morning. it is 3._______
a very important exam but i can’t afford to 4._______
fail it. i’ll spend all the whole weekend reading 5._______
and prepare for it. so i’m really sorry that 6._______
i won’t be able to come in this time. hope you 7._______
can understand. i’ll take this chance to wish 8._______
you wonderful time on your birthday. happy 9._______
birthday, peter, and many happy return of the 10._______
day!
参考答案：
1. on → for。 “thank for doing st.”意为“谢谢做某事了。”
2. go → come。 would like之后应接不定式to do形式。
3. had → have。全篇时态应一致。整篇文章不是叙述过去的事，所以不能用过去时态。
4. but → and或so。此处之意并非转折，而是递进或因果。
5. 去掉all。all与the whole weekend 相重复。
6. prepare → preparing。 "spend... (in) doing sth."意为“花费……做某事”。此处prepare 与reading是并列的。
7. 去掉in。
8. √
9. wonderful 前加a。time表示“一段时间或一部分时间，尤其用于a/an adj time"中时， time为可数名词。
10. return → returns。 many happy returns（of the day）是生日贺词，意为“祝你长寿或祝你长命百岁。”
