—— Oh, it’s raining hard outside. Mum, do you think the milkman will come?—— Of course. He will come on time _____it rains.
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.