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eaching a pronunciation class to a mixed group of learners can __ a teacher with many challenging problems. A. provide B. produce C. present D. offer 22. We want our children to know that hard work_____ . A. es off B. gives off C. pays off D. sees off 23. We can’t wait. We have to ____ the direction and the distance before we take action. A. make out B. figure out C. think out D. turn out 24. It____ to look after these naughty grandchildren of mine for a whole day. A. put me down B. drives me out C. wears me out D. pulls me through 25. We’d better try to ____ with the experiment, I think. Now let’s ___ with it. A. go through; go on B. go on; go over C. go over ; go through D. go on; go through 26. The host stood at the door and ______ every guest a wele. A. nodded B. dropped off C. shook D. moved 27. No one knows when XO was first discovered, or how it ___ to be such a popular drink. A. went B. came C. got D. became 28. The Party Central Committee ____ the Chinese people to work hard for the economic development. A. calls on B. calls up C. calls out D. calls for 29. We always ____ we have said. A. lead to what B. see to what C. get to what D. hold to what 30. Don’t fet to ____ your things after you have finished your homework . A. set aside B. put away C. take away D. put into 31. The actor was so i