She’s not strong enough________walking up mountains.
Mr. Smith came to our school in 2003. He _____ here for 10 years.
Some boys of Class One enjoy _____ pop music.
— Who listens ______ , Eric , Brad or Rick? — Of course Brad.
Mum, Harry Potter is my favorite great book. I ______ it three times already.
Liu Xiang was born in Shanghai _____ 13th July, 1983.