89. ______________　 90. ______________　

85. ______________　 86. ______________　 87. ______________ 88. ______________

81. ______________　 82. ______________　 83. ______________ 84. ______________

90. None of us was able to explain how the equipment _____________(起作用).

89. The whole country was in trouble, and the capital was troublesome in __________(特别).

88. Large ___________(大量的) of drugs were discovered hidden in the truck by the police, and the driver was arrested.

87. Practice is ___________(必不可少) to students who want to master a foreign language.

86. In my opinion, clothes made by hand are ________(优于) to those made by machines.

85. To what d_______ is he interested in computer games?

84. The instrument can be easily broken, so you should handle it with much c___________.