There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.
Now there’s a system _________ the waste is disposed of using the principles of ecology.
His son is very naughty and has formed some bad habits.I think he should .
Mary often does some translation work to earn extra money, which half of her income.
The examination results suggested that Iin poor health,so the doctor suggested that I more exercises to improve it.
—Can those at the back of the classroom hear me?—No problem, sir !