It takes us two hours _______ the piano every day.
When you are swimming, ________ your ears. You can use earplugs (耳塞) to stop water getting into your ears.
Turn off the water while you ________ your teeth or washing your hands.
It ________ about eight minutes for sunlight (阳光) to travel from the sun to the earth.
Talk to your teacher and you will get help ________ you have a problem.
We have friends to help us fight against pollution, and trees are one of ________.