The gas tank____________ twenty gallons of gas, but now it may____________ only three gallons.
Something ___ to save our earth. Do you think so?
I’ m sorry, I mistook you ___ your sister ___ mistake.
The scientists are trying to ___ natural energy to decrease air pollution.
China is ___ the east of Asia while Japan is ___ the east of China.
He spoke so slowly that we all could ___ him.