用exercise的正确形式完成句子

He ________ in the gymnasium three times a week．

用since或before填空

It will be 3 weeks ________ we have a vacation．

用since或before填空

It was half a year ________ everything returned to normal after the flood．

用since或before填空

It is 12 years ________ my brother joined the army．

用since或before填空

I haven’t seen my sister for 4 months ________ I last saw her．

用since或before填空

Why didn’t you go with him, ________ you were eager to leave here?

根据汉语完成句子

玛丽惭愧于她的失败。

Mary ________　________　________ having failed．

根据汉语完成句子

他撒了谎，对此他感到羞愧。

He ________　________　________ he had lied．

根据汉语完成句子

他不好意思被人看到去看牙。

He ________　________　________ be seen going to the dentist’s．

根据汉语完成句子

待了这么久我觉得很不好意思。

I ________　________　________ myself ________ having stayed so long．