.--Can I help you? --Yes. I bought this computer here yesterday, ,but it ______ now.
Charles Babbage is generally considered to _______ the first computer.
----I have got a headache. ---- No wonder. You ________ in front of that computer too long.
The police ________ the lost child and tried to find his parents.
It’s very hard for Mary to work here, for ______ she does can’t satisfy her boss.
______ that he has wasted too much time, the boy is determined to stop playing video games.