--When did you become a volunteer for the elderly?-- Two years ago. I this group since then.
Great changes __ in the city in the past 20 years, and a lot of factories ____.
--Which of the following sentence is right? --I wonder _________.
The factory which I visited yesterday was not the one I once worked.
Many countries, American, Japan, Brazil and Spain wanted to host the 2016 Olympic Games.
―Hurry up. The bus is coming, ―Wait a moment. Don’t cross the street the traffic lights are green.