Did you know the Earth is home to __________ animals?

The man didn’t know _________ the thief broke into the house and stole all his valuable things

_____are the socks?—_____ black.[ ]

Why hasn’t Mr. Li come to work yet?—Because he _______Guangzhou for a holiday.

_______ no ad during TV plays.—Great move! I cannot tolerate those annoying ads appearing every several minutes.