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it’s going to be a big , it could be. I wonder ______ we can do about it. A. if B. how C. what D. that 23. There is a feeling in me ______ we’ll never know what a UFO is not ever. A. that B. which C. of which D. what 24. Perseverance is a kind of quality and that’s _____ it takes to do anything . what B. that C. which D. why 25. _____ be sent to work there? A. Who do you suggest B. Who do you suggest that should C. Do you suggest who should D. Do you suggest whom should 26. Are you still thinking about yesterday’s game?Oh, that’s_____. A. what makes me feel excited B. whatever I feel excited about C. how I feel about it D. when I feel excited 27. Eat_____ cake you like and leave the others for_____ es in late. A. any。 who B. every。 whoever C. whichever。 whoever D. either。 whoever 28. People have heard what the President had said。 they are waiting to see_____ he will do. A. how B. what C. when D. that 29. There is a new problem involved in the popularity of private cars_____ road condition need_____. A. that。 to be improved B. which。 to be improved C. where。 improving D. when。 improving 30. It is pretty well understood______ control the flow of carbon dioxide in and out the atmosphe