---Which star is _____from the earth, the moon, the sun or the Mars?---The moon, of course.
Jimmy and Timmy are both 50 kg, that is to say, Jimmy is _______Timmy.
China is one of _______countries in the world.
. --________?--He’s friendly and helpful. He often helps me with my homework.
When he walked_______ my desk,he knocked my books________ the floor.
When you are doing reading exercises, it is a good idea to _________ the questions before you read the articles.