Last week I wrote to the hotel to book a room, but they （） yet.

单项选择题（）by a large audience, he felt very nervous and didn’t know what to say.

A．Watching
B．Watch
C．Watched
D．Having watched

单项选择题I’m very grateful for your help and hope to do something for you（）in the future.

A.in exchange
B.instead
C.in return
D.in particular