On summer nights, we often go to sleep the window open.[ ]
We have to stay at home instead of going finishing because it is raining .
Hello, Sandy. This is Jack. What are you doing? -I’m watching a match. It started at 7 p.m. and _____ on for another half an hour.
There is ______ “u” in the word “your”.
Everyone knows ______ Olympic Games will be held in London in July, 2012.