______ he got ready to leave home, his parents came tohis home.

It was wrong to cut down the old tree which dates back to 1915, _______ the reason．

A wonderful idea ________ me that day when I met with a tough problem，.

下列各句中，没有语病的一句是

______ those students Chinese, do you have to speak their language very often? — No, they learn most when the class is taught in a foreign language. [ ]