We _______ talk loudly when we see the sign “ Be quiet ”on the right.
Lady Gaga is famous _______ her beautiful voice.
–What did the policeman say to you just now?--He asked ______ when the accident happened.
-- What did your sister say _____ you?-- She reminded me _____ her birthday.
I’m usually free _____ Tuesday _____ Thursday.
There are _____ places of interest we could visit in Beijing.