—____when has the country been open to international trade?—1978,I suppose.
In hot and dull summer afternoons, icy coffee ______ a wonderful drink.
It is required that the students _____ mobile phones in their school, so seldom _____ them using one.
When Alice came to, she did not know how long she_______there.
My parents made _____ their daily routine to go out for a walk in the evenings.
If you make_ _ most of forty-five minutes classes day after day, there will be ______switch in grades.