49、My mother can't get ( ) because she has rheumatism(风湿病).

30. Anthropologists were intrigued to learn that Kennewick Man was ( ) different from today ' s native Americans .

29. Salespeople here are paid on a commission basis; however, continued employment is based on their ability to sell service contracts rather than ( )

28. The ( ) cited study suggested that parental involvement in homework can boost a student ' s academic performance.

27. Major airlines have banned the transport of hunting trophies from Africa in the ( ) of the outrage over the shooting death of a lion in Zimbabwe .

26. The parents almost collapsed upon learning that their child had been diagnosed ( ) a rare disease.

25. The country is making progress on it bailout reform commitments but bad bank loans could ( ) a fledgling recovery .

24. The governor posted a statement online saying he " misspoke " and tried to ( ) his comments .

23. As previously suspected , the inhabitants of the region had been hunter-gatherers living relatively ( ) lifestyles .

22. The volcano ( )on Friday , opening up an 800- meter - long crack in its crater .

21. The program includes an ( )of program options for ESL / EFL teachers .