( ) （10） The children are showing their things each other.
A. to B. for C. at
If I ____ you tomorrow, I will give you the receipt.
A. see B. will see C. am seeing
—— What day is today? —— It's ______.
A. Monday B. a fine dayC. September 1st
The students couldn't help ______ when they heard the joke.
A. to laugh B. laugh C. laughing
Do you know ______ this word?
A. what to spellB. how to spell C. to spell
Be quiet! The babies ________.
A. sleepB. are sleeping C. slept