Yosemite National Park has the best collection of native plants. ______, it contains a great number of trees and flowers from overseas.
| A．In addition | B．In return | C．In reward | D．In reality |
You should put on the notices ______ all the people may see them.
| A．where | B．in which |
| C．at | D．for them |
_____ I suggest, he always disagrees.
| A．however | B．whatever |
| C．Whichever | D．Whoever |
“Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”
| A．after | B．unless |
| C．until | D．when |
You will succeed in the end ____ you give up halfway.
| A．even if | B．as though |
| C．as long as | D．unless |
Not until I began to work ________ how much time I had wasted.
| A．didn’t I realize | B．did I realize | C．I didn’t realize | D．I realize |