为了方便大家的学习，新东方在线雅思网第一时间为大家准备了雅思语法模拟练习题，供大家阅读参考!新东方在线雅思网将第一时间为大家发布最新、最全、最专业的雅思报名官网消息和雅思考试机经及解析，供大家参考。

　　46. 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

　　47. His business was very successful, but it was at the ______ of his family life.

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

　　48. First published in 1927, the charts remain an ______ source for researchers.

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

　　49. 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

　　50. Doctors warned against chewing tobacco as a ______ for smoking.

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

　　46.C) expand 47. D) expense 48.B) indispensable 49.A) comes to 50.C) substitute