—We have done a lot to make our city cleaner，but it’s still not enough．
—So we should do________to improve it．
A．less
B．higher
C．later
D．more
________Gian________Tara are studying Chinese history and culture now．They find them rich and amazing．
A．Both；and
B．Not only；but also
C．Either；or
D．Neither；nor
—Do you know________Amy came to school this morning？
—Her bike was broken，so she had to walk．
A．why
B．how
C．when
D．where
My friend Frank sings well，and he is________good at playing the guitar．
A．not
B．also
C．yet
D．too
—Have you ever heard of Jeremy Lin？
—I only know he is________basketball player．
A．a
B．an
C．the
D．／
攀登岩壁非常危险。
________ ________ ________ ________danger in rock climbing．
