If we don’t protect the Earth, more and more wild animals will die out.
A. appear quickly
B. disappear completely
C. stay healthy
It’s wise of you to know how to deal with the problems.
A. wrong B. clever C. polite
Perhaps it will snow tomorrow.
A. Sometimes B. Never C. Maybe
It’s very important for a human being to be polite.
A. person B. encyclopaedia C. plant
There are more than 5,000 students in the school.
A. less than B. over C. just
This book includes six units.
A. has B. invents C. paints
