1 . There is a river near my home, into which large quantities of waste water _______ poured every day in the past.

A．were

B．have been

C．was

D．has been

2 . It is still a mystery ______ caused the infectious virus to spread quickly in this hospital.

A．which

B．where

C．what

D．that

3 . From my perspective, ________ matters most on one’s road to success is perseverance.

A．which

B．who

C．why

D．what

4 . ________ we’ve advanced our service quality is helpful in attracting more customers in the future.

A．How

B．Why

C．Which

D．That

5 . ________ embraces and respects the local customs will find it easier to fit in better with the local culture.

A．Who

B．Whom

C．Anyone

D．Whoever

6 . We should try every way to develop education, ________ it means slowing down in other fields.

A．in case

B．so that

C．even if

D．as though

7 . This pen is a birthday present that Father gave me. I hate to have to part with it___________ it is old.

A．even though

B．as soon as

C．as long as

D．now that

8 . ________ more and more students go abroad to further their study, many prefer to be admitted into the prestigious universities in our country, such as Peking University and Tsinghua University.

A．In case

B．As long as

C．On condition that

D．Even though

9 . The environment won’t be getting better ______ the majority of us take steps to reduce waste and pollution.

A．though

B．since

C．if

D．unless

10 . ________ conversion (转化) is quite universal, plenty of grammarians object to the practice of turning so many nouns to verbs in the language of English.

A．Even if

B．In case

C．As if

D．As long as