Mr. Li asks the students_____in the river, because it’s too dangerous.
Why does Liu Tao look all day long?
We __________ used computers many years ago, but now they’re everywhere.
—Can you tell the differences between these two pictures? —Differences? Oh, no. They look quite____________.
There’s rain on the road, so she should drive carefully.
--Must I clean the classroom now, Miss Wang? --No, you needn’t . It by Bill.