Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
----- ____________________________? ----- It’s black, B-L-A-C-K, black.
----- Hello, are you from America? -----_________________.
___________ sister is in Beijing .
-----What’s the weather _________ in Guangzhou in summer? ----- ________ hot.
Li Ming and Wei Hua _________ from Beijing. They are from Shanghai.