6.When making modern cameras , people began to _______ plastics for metal.
7.With the help of the government , a large number of people ---_______ after the flood in 1991.
8.He always has a lot of _______ ideas in his mind , and sometimes we do not even know what he is thinding about.
9.Please be serious. I am not _______. You should consider it carefully
10.We do not have a _______ school in our institute. The highest degree we provide for the students is a B. A. and a B. S. .