The thick mist _____ gradually as the sun rises．
A．passes out B．passes on
C．passes off D．passes away
My parents were not happy as they don’t approve ____ out at night．
A．of Mary and me staying B．of me and Mary staying
C．to Mary’s and my staying D．when Mary and me stay
We haven’t seen each other for 20 years, but I recognized him _____ I saw him．
Which of the following is wrong ?
A．immediately B．the moment
C．as soon as D．while
Life is the most important in the world so we should never compromise _____ safety standards．
A．with B．between C．on D．in
Generally speaking, when _____ according to the directions, the medicine had no side effect．
A．take B．taken C．to take D．to be taken
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号的相应位置上。
In this unlikely place, researchers are putting the seeds from flowering plants and trees in a sleeplike state．Many years from now, other workers will wake the sleeping seeds up to plant them
1.they are most needed．These seeds are 2.the legendary Rip Van Winkle, who fell asleep under a tree and woke up 20 years later．
The small farm, called the Greenbelt Native Plant Center, is part of a global effort to save 3.（threaten） plants and trees．Around the world, native plants are being crowded out by invasion newcomers．Native plants have less room to grow now 4.a result of the growth and spread of cities．And global warming is making some places hotter, drier, or different from 5.native plants are used to．
Experts used to think 6.possible to protect big-city plants such as American bittersweet because growth space is limited in urban environments．Crowding increases competition between natives and invaders, and the latter often win the battle．
7., scientists have found ways 8.fighting back．So far, workers at the Greenbelt Native Plant center 9.（gather） seeds from about 300 of those plants and put them in a sleeplike state．When 10.（plant） in the future ,these seeds could help restore damaged parkland and forests．
