The firefighters tried their best to________the forest fire.
I’m going to Sanya for the summer holiday ?-------______________!.
---Are you going to Shanghai by plane ?--- It’s fast , but expensive. So I’m not sure. I____ take a train
The Changjiang River is one of the _____ in the world.
Many foreign leaders arrived _ Beijing _ _Nov.6th 2014 to attend the APEC .A. at on B. at inC. in on D. in in
Do you know ________?