87. His teaching _____ was raised to twelve hours a week in college.
| A．burden | B．load | C．job | D．Work |
Measures have to be taken to teach young people how to ______ themselves both in family and in school. They don’t know the basic manners.
| A．do | B．perform | C．behave | D．work |
You have to learn how to be a ______ first, and then to be a student.
| A．human being | B．people | C．person | D．man |
______ the traffic jam, he didn’t catch his plane, which was reported to have crashed soon after it took off.
| A．Because of | B．On account of | C．Due to | D．Thanks to |
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
| A．to do | B．to have done | C．to be doing | D．to have been doing |
. You will see this product made in this factory _____ wherever you go.
| A．to be advertised | B．advertised | C．advertise | D．advertising |