He __________ well in the exam last week, so he __________ hard now.A. did, studied B. didn't, is studying C. didn't do, is studyingD didn't, studying
—Oxfam trailwalkers in Hong Kong have to climb________ twenty hills and mountains. —It’s really a tough hike.
_____ORBIS doctor who got here yesterday needed _______ X-ray machine to examine his patients.
—I’m sorry. That wasn’t of much help. — ________. In fact, it was most helpful.
—Simon, I wonder _______. —Last Saturday.
Young people usually_________ city life to country life while old people _______ enjoy country life.