____ has been proved again and again that ____ is said in the ads greatly affects people’s impression of the products.
We _______ finish it ahead of time, though it was such a tough task.
Mr White is ________ as one of the most excellent leaders in our company..
Thousands of athletes _______ in many countries competed ______ medals in the 2008 Olympic Games in Beijing.
The Science Museum, _______ we visited during a recent trip to Britain, is one of London’s tourist attractions.
The problem is _________ we can finish the work in time.