Scientists are convinced the positive effect of laughter_____physical and mental health.
| A．of, at | B．by, in | C．of, on | D．on, at |
Little Jim is going to spend his holiday in Paris, _____ lives his uncle.
| A．which | B．who | C．where | D．that |
The person we referred to（提及）____ us a report tomorrow．
| A．giving | B．will give | C．gave | D．give |
The research is so designed that once _____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
He wrote a lot of novels, none of _____ translated into a foreign language.
| A．them | B．which | C．it | D．what |
----- “Is there _____ here?”
------ “No, Bob and Tim have asked for leave.”
| A．anybody | B．everybody | C．somebody | D．nobody |