-------- The window is dirty. --------- I know. It __________ for weeks.
—Where are we going for the National Day,the mountains or the sea? —Either will be fine with me.
All the teachers and students _________ National Day with a party.
The stones each ________ as much as two tons.
________ to overcome the difficulty,he works day and night.
一Did he notice you enter the classroom? 一I don’t think so.He _______ to the radio with his eyes shut·