Ⅰ.根据提示写出单词的正确形式
1．Anyone who is keen on classical music can't miss the opportunity (机会) to attend the concert.
2．Mr. Smith nodded (点头) and asked every client to sit around the table.
3．She keeps yawning (打呵欠), so she might not have slept well last night.
4．He sighed (叹息), not knowing how to deal with the naughty boy.
5．What he is lacking (lack) in is not knowledge but experience.
6．It was an informal (formal) party, so you needn't have dressed up as a princess.
7．I can confidently (confident) promise that this year I will make great progress in my study.
8．Perhaps he used a kind of advanced (advance) technology so that he got better results.
9．Such an important problem should be discussed seriously (serious)．
