---What _____ useful book! And ______ book is popular with students.A. a, a B. a, the C. the , the
When he saw the poor conditions in the school, he decided to ______ some teaching instruments for them.
The flight to New York was ________ because of the heavy fog.
—What did you talk about just now? —My father asked me ___________.
______ you say sorry to your uncle, he won’t forgive you.
______ nice time the boys had playing football with the national team last Sunday!