—The similarities between social networks are striking.
—That ________ come as no surprise，because they are all products of the Internet.
| A．should | B．shall | C．may | D．must |
A person , when_________，can often do what is normally beyond his ability.
| A．challenged | B．challenges | C．challenging | D．to challenge |
Walt, feeling a bit tired, decided to stop off ______ in Hong Kong on the way to Singapore.
| A．briefly | B．constantly | C．finally | D．gradually |
His best movie was about the life of Gandhi in India, ______ won several Oscar awards.
| A． where | B．who | C．which | D．that |
I prefer to be ______ at a hotel with free room service and access to the Internet.
| A．put up | B．set up | C．made up | D．picked up |
Believing in people is the key to motivating people to ______ their potentials.
| A．have | B．hide | C．reach | D．limit |