My father and his teacher talked a lot about the things and persons ___ they could remember.
The theory by Einstein was later to prove true, but at that time few people could accept it.
____________ your father saw you, what would he say? A. IfB. Suppose C. Unless
I'm happy ________________ you are happy. A. if B. unless C. as long as
_________ I am, I will be thinking of you. A. Where B. Wherever C. Who
Wuhan lies _____ the Changjiang River and the Han River meets. A. where B. wherever C. that