They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
________ all the homework assigned by the school, the students have to work at it till midnight.
________ in the countryside made Mr. Wilson very hardworking when he was very young.
—The cars give off a great deal of waste gas in the streets.—Yes. But I'm sure something will be done to ________ air pollution.
It's a headache trying to ________ in a strange, new town. I will just take a taxi and avoid all the trouble.
Many people headed for the water to ________, including rivers, bays in the seaside of the country.