12.The new cancer treatment was ___in the early eighties by Dr Sylvia Bannerjee,so he was praised widely for his contribution in the world.( )
A. | provided | B. | explained | C. | conducted | D. | pioneered |
7.A computer ____________ think for itself; it must be told what to do.( )
A. | can't | B. | couldn't | C. | may not | D. | might not |
6.--Shall I tell John about it?( )
--No,you __________.I've told him already.
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--No,you __________.I've told him already.
A. | needn't | B. | wouldn't | C. | mustn't | D. | shouldn't |