With time going by, we have come to realize that creativity is _______it takes to keep a nation highly competitive.
| A．what | B．how | C．why | D．that |
_______is no good always complaining about life. At least, we are living.
| A．It | B．There | C．This | D．That |
Helen listened carefully _________ she might discover exactly what John wanted.
| A．so as that | B．in order that | C．in order to | D．so as to |
Smoking, which may be _______ for some people, can cause great ______ to our health.
| A．fun; destroy | B．fun; damage | C．a fun; harm | D．a fun; hurt |
The role that our army_____ in flood control is very important.
| A．made | B．acted | C．played | D．did |
I was very______ for him because he helped me out of trouble.
| A．grateful | B．calm | C．loose | D．worried |