The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
When ____ to danger and conflict, men tend to increase blood pressure, ______ nervous and anxious.
I lost sight of Wang Ping when we reached _________ looked like a large market.
According to the air traffic rules, you ___ switch off your mobile phone before boarding.
— Do you think another Korean War will break out? —Only through peaceful dialogues can a war be avoided.
While studying, fix your mind on what is really important, or you willremembering nothing.