Professor John will give us a lecture on how to learn English, but when and where ____ yet.
The government has taken some measures to solve the shortage of water, but it may be some time __ the situation improves.
— Why was it so noisy over there? — The Twins were surrounded by their fans ____ they stepped out of the hall.
Among the many dangers_________-- sailors have to face, probably the greatest of all is fog.
Mr. Black is willing to do ____________ Mrs.Black tells him to do.
_______ you are supposed to do is _______ it if you don’t like a thing. Don’t complain.