--Shall we go fishing tomorrow ? --_______
Things are ________ on Mars ________ on Earth because of the different gravity.
---Be careful. You might fall into the river.---Thank you. I ________ I ________ so close to it.
Mary, along with her parents ________ Hainan for a week and they will come back soon.
That little boy preferred ________ out to play rather than ________ TV at home.
________ information! I hear you have finished writing a ________ report.