They arrived _______ Beijing on the evening of May 24.A. at B. in C. on
—Is your uncle an ________?—Yes, he recently invented ________ useful machine.A. invent, theB. inventor, anC. inventor, a
—There is too much ________ on the floor. Why did you make it much too ________?—Sorry, Miss Gao. I will clean it at once. A. dirty, dirtB. dirt, dirtyC. dirt, dirt
The earth gets ________ every day, so we should stop ________. A. polluted, pollutionB. pollution, pollutedC. pollute, pollution
She some mistakes in her exercises the day before yesterday.
—Will you come to the dinner party?—I won’t come until Jenny .