--- The fog is so thick that the express way ____ have been closed. --- You are right. I ____ have thought of that. Now we have to take another road.
. School children must be taught how to deal with dangerous ________.
The survey shows that ______ of the population in the country ______ adults.
. The workers do nothing but _______ tea and talk to each other.
Every year, a great many visitors come to visit the temple ______ the 12th century, ______ has brought a large income.
. She makes _______ effort to learn maths and she has made _______ great progress in it.