Mr. Green works in office, but his sister works a farm.A.a, in B.an, in C.an, on
---Could you tell me _________? ---You can take the No. 1 bus.
They will lose the game _______ they try their best.
---I have changed my job. ---_________
Tom’s mother told him _______ eating too much meat.
---Is the man over there Mr. Brown? ----It ______ him. He has gone to Brazil to watch the 2014 FIFA World Cup.