In this institution a medal together with a prize of certain sum of money _______ gains success in science and technology every two years.
My parents have promised to come to see me before I _________ for Africa.
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.