At first， he didn't know what he could do in the new group．（改为简单句）
At first， he didn't know do in the new group．
The study group discussed the problem again and again， and they f worked it out．
Before you t away anything， always think whether it can be reused or not．
U you work hard， you will not succeed．
For visitors to Guangzhou， there are p of places to experience its culture．
It's a general rule to keep q in libraries and concerts．