Would you like to walk along Yueya Lake with me tomorrow afternoon—Certainly, ______ I am too busy.

One of our rules is that every student ____ wearschool uniform while at school

In the near future，more advances in the robot technology ________ by scientists.(2011·湖南)

How about climbing the hill — I would rather __________ along theriver than __________ the hill. I’m a bit tired.

He told me that by the end of this yearthey______together for twenty years．