I was about to go out ______ the telephone rang.
18. It was ______ back home after the experiment.
17. -- My mother always tells me to try my best _______ many difficulties. -- I can’t agree any more. _______ you put your heart into work, you can overcome them.
16. Charles Babbage is generally considered _______ the first computer.
15. __________ made his mother worried.
14. His careless driving _________ the traffic accident. That is, the traffic accident was ______ his careless driving.