The next king of Prussia, Fretrick WilliamⅠ,        the Amber Room belonged, decided not to keep it.

He is very grateful to the girl____ he often turns for help when he meets with difficulties.

He is very grateful to the girl____ he often turns for help when he meets with difficulties.

A．whom            B．to whom          C．to who            D．which

I know a lot about the gentleman, ____________ this expensive watch belongs.

 Encouraged by my science teacher, I set about my studies on developing my product, _____I hope I will succeed in applying for a patent（专利）.

A．with whom        B．to whom          C．through which      D．for which