－Is that yourbike, in front of the blackone－No. It’s______.

I have nothing________ but________ computer games.

Mr Song said that global warming was largely for the country’s frequent extreme weather in 2011 .

He usually goes to work ______ his bike, but today he goes ______ foot.

rew taught his students how to develop thebasic skills in the physics class, ______ everything through jokes andexperiments