.
The best music teacher in the school has hurt his left foot and cannot ______ tomorrow’s concert.
| A．take part | B．play a part in | C．participate in | D．participate |
_____ I admit that there are problems, I don't' think that they cannot be solved.
| A．Unless | B．Until | C．As | D．While |
Jane was asked a lot of questions, but she didn’t answer of them.
| A．other | B．any | C．no ne |
D．some |
-------John and I will celebrate our fortieth wedding anniversary next month.
--------Oh, _________!
| A．cheer up | B．well done | C．go ahead | D．congratulations |
As your instructor(教师) advised, you ought to spend your time on something ____ researching into.
| A．precious | B．worth | C．worthy | D．valuable |
_____ the fact that his initial(开始的)experiments had failed, Pro. White persisted (坚持) in his research.
| A．Because of | B．As to | C．In spite of | D．In views of |