1.---Where___are_（is）your socks?---They're under the bed.
2.---How old are_you___（your）?---I'm thirteen years old.
3.---What is Bai Ling doing?---She is_playing___（play）games.
4.---What can you see?---I can see four_buses___（bus）.
5.---Where is your friend from?---He is from__America__（American）
6.---Let_me___（I）help you.
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