The boy was doing homework while his mother dinner.
When H7N9 bird flu first appeared,people didn’t know _____ doctors could cure it.
------Do you mind me sit here?------_________,it’s for Mr Brown.
I was born ___ the evening ___ March 12,1997.
Have you seen ______ pen? I left it here this morning.Is it ____ black one? I think I saw it somewhere.
___ it was very cold, ___my friend still went swimming in Jialing River this morning.A. Although;/B. Although; butC. But; although