I stay at home _______ on weekends, but I don’t feel ______..

Lucy’s travelled on a plane. －.[ ]

. — What’re you going to do to protect the environment? — Plant trees on side of the river.

We get _______ sometimes when we study in a group. But we can learn from each other in this way.

Yesterday I had a word with the CEO of the company, ___ who used to teach at Beijing University．