16. The board of the company has decided to ________ its operations to include all aspects of the clothing business.

A) multiply B) lengthen C) expand D) stretch

17. His business was very successful， but it was at the ________ of his family life.

A) consumption B) credit C) exhaustion D) expense

18. First published in 1927， the charts remain an ________ source for researchers.

A) identical B) indispensable C) intelligent D) inevitable

19. Joe is not good at sports， but when it ________ mathematics， he is the ‘best in the class.

A) comes to B) comes up to C) comes on to D) comes around to

20. Doctors warned against chewing tobacco as a ________ for smoking.

A) relief B) revival C) substitute D) succession

16-20 CDBAC

21. When carbon is added to iron in proper ________ the result is steel.

A) rates B) thicknesses C) proportions D) densities

22. You should try to ________ your ambition and be more realistic.

A) reserve B) restrain C) retain D) replace

23. Nancy is only a sort of ________ of her husband‘s opinion and has no ideas of her own. A) sample B) reproduction C) shadow D) echo

24. Now that spring is here， you can _____ these fur coats till you need them again next winter.

A) put over B) put away C) put off D) put down

25. There is a ________ of impatience in the tone of his voice.

A) hint B) notion C) dot D) phrase

21-25 CBDBA

26. Please ________ dictionaries when you are not sure of word spelling or meaning.

A) seek B) inquire C) search D) consult

27. At yesterday‘s party， Elizabeth’s boyfriend amused us by ________ Charlie Chaplin.

A) copying B) following C) imitating D) modeling

28. She keeps a supply of candles in the house in case of power ________. A) failure B) lack C) absence D) drop

29. The group of technicians are engaged in a study which ______ all aspects of urban planning.

A) inserts B) grips C) performs D) embraces

30. The lecture which lasted about three hours was so ________ that the audience couldn‘t help yawning.

A) tedious B) bored C) clumsy D) tired

26-30 DCADA