We can have ___ blue sky if we create ___ less polluted world.
— Our classroom every day. — So it is. It is our duty to keep it clean and tidy.
—Who her father? —He must by that policeman.
—How can I get a present in the game show? —You _________ one if you answer all the questions correctly.
—When _______ this stone bridge______ ?—In 1935.
Spanish ________ as the official language in Cuba.