It long before we the result of the experiment．
A．will not be；will know B．is；will know
C．will not be；know D．is; know
－I wonder do you think of Bob?
－Selfish but honest．
A．how B．what C．if D．whether
They couldn’t stand like that．
A．be treated B．to treat C．treating D．being treated
Finding information in today’s world is easy．The is how you can tell if the information you get is useful or not．
A．ability B．competition C．challenge D．knowledge
The train was to arrive at 11：30，but it was an hour late．
A．about B．likely C．certain D．supposed
According to the air traffic rules，you should your mobile phone before boarding．
A. switch over B.switch on C. switch off D. switch round
