Mr. Green works in office, but his sister works a farm.A.a, in B.an, in C.an, on
Sam enjoyed collecting. He has collected over three _______stamps.
The old man can’t hear us well because there’s something wrong with his ______.
Mum likes making pictures and the pies she cooks always taste _______.
John is fond of swimming. His hobby is different from______.
Beijing is one of ______ biggest cities in China.