Many children prefer_________games on the computer rather than________outside.
| A．playing; playing | B．to play; to play | C．to play; playing | D．to play; play |
Food, ______ and shelter are the three most necessary things for people to depend on.
A. clothes B. clothing C, cloth D. dress
I into robots and used to make mobile phones as well as help with medical operations.
| A．have put | B．have been put | C．had put | D．had been put |
Over time my memory has developed much that, like an elephant, I never forget anything I have been told.
| A．really | B．such | C．too | D．so |
I developed very slowly and it took nearly two hundred years I was built as an analytical machine by Charles Babbage.
| A．before | B．after | C．long | D．short |
_____ the boy is determined to do something , no one can stop him.
| A．Even if | B．Now that | C．Once | D．However |