.We cannot figure out ____quite a number of insects, birds, and animals are dying out.
| A．that | B．as | C．why | D．when |
Saving money is ________ we must do.
| A．what that | B．anything that | C．something that | D．something which |
_______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 |