________．Open up your umbrella(雨伞)．
A．It's windy B．It's snowy C．It's rainy
( ) If I ____ you tomorrow, I will give you the receipt.
A. seeB. will seeC. am seeing
( )—— What day is today —— It's ______.
A. MondayB. a fine dayC. September 1st
( ) The students couldn't help ______ when they heard the joke.
A. to laughB. laughC. laughing
( ) Do you know ______ this word?
A. what to spellB. how to spellC. to spell
( ) Be quiet! The babies ________.
A. sleepB. are sleepingC. slept