Mark Twain left_____ school at _____ of twelve to look for work. A the ; the B / ; the C / ; / D the ; /
It was not until the teacher had explained it three times _______ how to work out the problem.
Only after my friend came ____.
Dickson left his father’s firm and ____business on his own.
There is no doubt _______international cooperation is the key to dealing with cyber crime.
Considering your salary, you should ________ at least 100 dollars a week.