急急!Please be q_____ in the reading-room.

急急!Please be q_____ in the reading-room.
1、when are you _____ our school?
A、aeeive at B、arriving
C、arriving in D、arriving at
2、It's hot today.How about going swimming after school?
____!Let's ask Daniel to go with us
A、That's OK B、Best wishes C、Good luck D、Good idea
3、The classroom is ___clean___.(用反义词改写,句意不变.)
The classroom is ___ ____.