A．whereB．whomC．which

This is the book（)I have learned a lot.A. to whichB. by whomC. from which

A．whoB．whomC．whatD．which

【C2】A．whereB．whenC．thatD．which

Their country has plenty of oil, ______ ours has none.A．whereB．asC．whereasD．which

It was in this house _______ we used to live in.A: whereB: thatC: whichD: in which

The young man ______ teaches us English is from America.A: whoseB: whomC: whoD: which