I _______ have met him a long time ago. Both his name and face are very familiar.
| A．may | B．can |
| C．would | D．should |
He narrowly escaped _______ by the falling tree.
| A．to be injured | B．being injured | C．injuring | D．having injured |
_____ is known to us all, a skill can only be acquired through hard work.
| A．It | B．As | C．What | D．That |
There is no doubt _____ short sight is a serious problem among the youth of our country.
| A．which | B．whether | C．what | D．that |
From the deep valley ______, which had my heart in my mouth.
| A．came a frightening sound | B．a frightening sound came there |
| C．did a frightening sound come | D．a frightening sound did come |
______, I always feel I want a few more days.
| A．However long is a vacation | B．However long a vacation is |
| C．However is a vacation long | D．However a vacation is long |