The river _____ are covered with trees is very long.
—Don't use my handkerchief to wipe the table,gentleman.—Oh, I' m very sorry.I________clearly.
The school rule states that no child shall be,unless________by an adult,allowed out of the school during the day.
—How do you deal with the disagreement between the company and the customers?—The key________ the problem is to meet the demand____ ____by the customers?
Prices of daily goods________through a computer can be lower than store prices.
The poor little boy________by his heartless parents was seen begging in the street.