81. When the farmer came back from work, his pet dog jumped out the door to welcome him.

A. from B. from behind C. of D. of behind

82. ___ he was ill, I was expected to take his place greatly surprised me for I didn't have much working experience.
   A. If B. That if C. That D. If that

83. _____ scenery in national parks is usually attractive.

A. A B. An C. The D. One

84. If you have a cold, stay at home so that you won't spread it to _____.

A. another B. the other C. others D. the others

85. Those _____ to go to the exhibition should inform the office.

A. not wanting B. who not want C. not wanted D. are not want 

86. The children _____ and we will never neglected them.

A. brought up well B. was brought up well

C. had been well brought up D. have been well brought up

87. The mountain village is my hometown. I spent _____ merry night there when I was young.

A. a great many B. plenty of C. many a D. a great deal

88. In all English towns there is a speed limit of 30 miles an hour, _____?

A. is there B. isn't there C. is it D. isn't it 

89. Why are you always making the same mistake? Think of _____ I told you.

A. that B. when C. how D. what 

90. Nothing is _____ time; yet nothing is less valued.

A. more precious than B. less precious than

C. most precious D. as precious as

81. B

82. B That引导的是主语从句，而 if 从句是that主语从句中的条件状语。

83. C

84. C

85. A not wanting 等于who do not want.

86. D

87. C many a merry night= a great many /plenty of merry nights .

88. B

89. D of后面是介词宾语从句，需要连词且在从句中做 tell 的直接宾语；所以用 what， that 在名词性从句中补充当成分，没有实在意义。而BC连接副词，在从句中只做状语。

90. A 否定意义的词语与比较级连用，表示最高级的含义。