---I called you at 4:00 yesterday afternoon, but nobody answered.---Sorry, I ______ with my friends at that time.
一Can I help you? 一Yes,please.I want to _______ a gift for my best friend.
Ye Shiwen is talented _______ swimming.
His two sisters ______ teachers.
Our city is getting ________.
Mona often eats junk food,________ she knows it is bad for her health.