48.The Minister of Finance is believed（ ）of imposing new taxes to raise extra revenue.

52.Mary is（ ）hardworking than her sister, but she failed in the exam.

51.When you have finished with that book, don’t forget to put it back on the shelf,（ ）?

80.Our experiment was conducted under （optimal） conditions. The underlined part means（ ）.

79.The employers prepared, with all due（ ）for a conference with the Trade Unions.

78.There is no （conceivable） reason why there should be any difficulty during the project. The underlined part can be replaced by all the following EXCEPT（ ）.

77.The whole country was in（ ）over the result of the elections.

76.His mother retired early （on account of） poor health. The underlined part means（ ）.

75.The flags in the stadium（ ）in the wind.

74.Our school did not（ ）for Christmas until mid-December.

73.He （turned his back on） them when they most needed him. The underlined part means（ ）.