a/ Read the following passage and look carefully at each line. If a line is correct, put a tick (√ ). If a line has a word which should not be there, underline the word and write it in the space provided.

     A recent investigation carry by scientists at the U.S. Geological survey shows that strange animal behavior might help predict future earthquakes. Investigators found such a occurrences in a ten-kilometer radius of the epicenter of a fairly recent quake. Some birds were screeched and flew about wildly, dogs yelped and ran around uncontrollably. Scientists believe that animals can be perceive these environmental changes as early as several days before the mishap.
      In 1976, after observing animal behavior, the Chinese were able to predict a devastating quake. Although many hundreds of thousands of people were killed, the government was able to evacuate millions of an other people and thus keep the death toll at a little lower level.
b/ Fill in the blanks with a suitable prepositions.
1.     George fell ..................the bladder while he was painting the ceiling.
2.     We stopped everyone ......................leaving the building.
3.     Admission  ....................university depends .......................examination results.
4.     Don’t  use that dictionary. It is ....................date. Find one that is ...................date.
5.     She came in the hall ………………saying a word.
6.     I apologize ……………..you …………………not phoning you last night.