Sorrry to keep you _______.
A. wait
B. to wait
C. waiting
D. waited
Go ______ the gate one by one , please.
A. at
B. near
C. next to
D. through
Excuse me, could you do me a _______?I lost my phone at Dongpo Road in Line 7.
A. help
B. favor
C. call
D. hand
It's one of __________ subways in the world.
A. famous
B. the most famous
C. more famous
D. famousest