Most of the professors _____ to our school were from South Africa．
A．invited B．to be invited C．being invited D．had been invited
You may take half of the cake; they’re exactly the same.
A. both B. either C. any D. each
by the growing interest in nature, more and more people enjoy outdoor sports.
A. Influenced B. Influencing C. Having influenced D. To be influenced
The best reporters have been sent to South Africa to ______ the 2010 World Cup, so we can get informed of the situation there very quickly.
A. support B. rescue C. cover D. prevent
Listen! Do you hear someone for help?
A. calling B. call C. to call D. called
______ most of us considered solving the problem as soon as possible, he considered it of no importance．
A．When B．While C．If D．As
