Tom, clean up the broken glass _________ someone walks on it.
We were all surprised when he made it clear that he ___ office soon.
I hope to call ___ you ___ your office at two o’clock today.
Mr. King, the legs ___ were badly hurt, was taken to hospital.
___ to go shopping with me?
---Is there ___ you don't understand?---I think ___ is quite clear.Thank you.