Who teaches _______ English?

Do you know the cost of buying a house in Shanghai is much higher than __ in Tibet? —Of course, I know. It’s impossible for me to buy_____ there.

I called you at half past nine this morning, but there was no answer.——Oh, sorry. I _____ with my cousin in the supermarket.

Who watered the flowers beside the window?——Helen ____________.

I’m not feeling well. I may have ____ bad cold.