—Scissors can be dangerous, so you ____________ play with them.— OK, I won’t.
By the time he ______ at the railway station, the train ______.
–We will visit the Summer Palace ______ there is a heavy rain tomorrow.--OK! Boating on the lake must be great fun.
–How long ______ the restaurant ______? --For eight years.
–What should I do ______ healthy, doctor? --You should take more exercise.
–Have all the boys known that they ______ an English test this afternoon?--Yes. Every boy has been told about it.