---Do you know ________?
--- I'm not sure. Maybe he is a businessman.
| A． who he is | B．who is he | C．what he does | D．what does he do |
All passengers ___ to show their tickets next time.
| A．require | B．will require | C．are required | D．are to require |
He placed one of the arrows __ his bow.
| A．in | B．on | C．at | D．against |
___ from a plane, the Great Wall looks like a huge dragon.
| A．Seeing | B．Seen | C．To see | D．Look out |
Africa is actually connected with Asia at the spot ___ the Suez Canel was dug.
| A．when | B．where | C．which | D．and |
Many buildings ___ in the eathquake.
| A．put down | B．lay down | C．fell down | D．knocked down |