Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.

He _______ cards with his friends, but now he _______ a walk after supper.

(2013·湖北，22)Carbon dioxide, which makes a________between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.

With modern equipment，many mysteries have ________ to light in recent years.

 The train is running ______120 kilometres an hour.