David had to __________the invitation to the party last weekend because he wasn't free( )
A.turn onB.turn downC.turn upD.turn off
I will tell my daughter as soon as she _________ back from work.
Sue told me that she ____________ shopping with her sister the next day.
By the end of last week, she______in the west of China for two months helping the homeless children.
Ken was so busy when we saw him, because he _______ a speech the next day.
--- What did he tell you just now?--- He said that ____________ tomorrow morning.