76. The plan is too complicated. We will ________ (简化) it.
77. Having ________(遭受) such heavy pollution, it may be too late to clean up the river.
78. Tom is working hard because he is ________(坚决的) to pass the exam.
79. When I came in, the naughty boy ________(假装) to be reading his book.
80. They wanted to set up a wild animals _________(保护区).
81. In ________(此外), he learned English by himself.
82. Over the years , I have ________(积累) hundreds of books.
83. We need your help to ________(筹集) money for the educational research.
84. Scientists ________ (分析) samples of leaves taken from the area.
85. It might be ________ (值得做的) to recall a few important facts.