— I hear Johnson was badly injured in the accident.
—（）, let's go and see him.

单项选择题--Sorry, but I must go and catch the plane now. --Can we（）a time for another discussion

A. date
B. fix
C. make
D. prepare

单项选择题Everyone is busy working. You can't stay here（）you keep quiet.

A. when
B. once
C. if
D. unless