From facts, scientists have_______ that more energy is being absorbed from the sun, throwing the earth’s energy “out of balance”.

If better use is _____ your spare time, you’ll make greater progress in that.

Only by working hard can you ______ the goal.

I phoned my first teacher time and again when I heard that he was ill, yet couldn’t_______

I ___in North China, but now I ___ the weather in South China.