--Why don't you try your best to get on the bus?—I tried to , but I could, it started moving.
---What is our earth like ________from the moon? ---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
I’d rather have a room of my own, however small it is, than a room with others.
It was raining heavily. Little Mary felt cold, so she stood_____ to her mother.
The teacher couldn’t make himself attention to because the students were so noisy.
My father served in the army in when he was in .