The following is a timetable in Shanghai Pudong International Airport．

Airline	Flight Number	Destination	Departure	Gate
Air Canada	137	Beijing	10:12 a．m．	24
Japanese Airlines	320	Tokyo	10:30 a．m．	18
British Airways	405	Paris	11:00 a．m．	20
Pan American	226	London	11:20 a．m．	12
Pan American	12	Beijing	11:43 a．m．	15
Air Canada	178	Tokyo	12:32 a．m．	21
CAAC	289	Hong Kong	12:32 a．m．	14
CAAC	314	Moscow	12:45 a．m．	18
British Airways	230	New York	12:55 a．m．	23

A man wants to take Flight 178 to Tokyo. Which gate should he go to?

A．14

B．28

C．21

D．18

Lisa is at gate 23. Where is she going?

A．Paris

B．Beijing

C．Tokyo

D．New York

Now it’s 10:40. Mary is at gate 20. Which airline’s plane will she take?

A．British Airways	B．Japanese Airlines
C．Pan American	D．Air Canada

Gate _______ is the busiest among all these gates.

A．23

B．18

C．24

D．15