take me about two hours to do the work!—Oh, ! I could do it in half an hour.

I am really struck by your spoken English. You speak so fluently. Have you been abroad—Yes. I ______ in London for two years.

e governments and scientists not worked together, AIDS-related deaths _________ since their highest in 2005.

She has been practising _______ the same tune on the piano for nearly an hour. [ ]

Sir, Jenny wants to know when she can leave the office.—– Only when she ______ copying this report.