If you don’t keep the meat in the refrigerator on such a hot day, it may ____.
| A．go out | B．go away | C．go off | D．go down |
I refuse to lie about it, because it’s against my _____.
| A．rules | B．orders | C．principles | D．laws |
The buses, _____ were already full, were surrounded by anxious people.
| A．all of them | B．all of which | C．they all | D．all which |
The murderer, who was _____ to death by the judge last week, was only 20 years old.
| A．made | B．caused |
| C．killed | D．sentenced |
The black hero fought all his life to make black and white people _____.
| A．fair | B．same | C．equal | D．legal |
Only _____ people can have a good understanding of the lecture given by the scientist.
| A．educated | B．devoted | C．concerned | D．relaxed |