— Jim and I will go to the post office this afternoon.—________. ________ go together ?
________ plastic bags we use, ________ it will be to the environment.
Noise pollution can cause people to become sick. So our government has done________to stop it.
He _______ his head to see the _______ sun.
-These farmers have been to the United States.-Really? When _______ there?
The weather in Beijing is cooler than _______ in Guangzhou.