.—Why are you looking so worried? —I sent an email to my son in America last week, but no reply ________.
This is my dear teacher without_________help I couldn’t have passed that difficult exam.
It was ten years ago__________he was put into prison because he fought against the government.
__________from what everyone says about him, I would say he has a good chance of winning.
The two things _______they felt very proud were Jim’s gold watch and Della’s hair.
According to the survey, two thirds of the area__________covered by trees now and 90% of the population__________contributions to the Greening Project in the city.