专项练习

1. Economics, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students.
A. prove     B.  proves     C.  have been proved     D.  are proved
 
2. A thousand miles no longer _______ much to us today, for modern jets can easily get us to a great distance within a matter of a few hours.
A. meant     B.  means     C.  mean     D.  will mean
 
3. The secretary and treasurer of our company  ______  the meeting.
A. were to attend     B.  are to attend     C.  is attend     D.  is to attend
 
4. Cattle ______   to graze on the village common.
A. are allowed     B.  is allowed     C.  allows     D.  allow
 
5. Mathematics as well as other subjects ____ a science.
A. was     B.  is     C.  are     D.  belong to
 
6. Either of these young ladies ____ perfectly qualified to teach Greek, Latin and French.
A. were     B.  are     C.  is     D.  have been
 
7. Large quantities of water  ______   cooling purposes.
A. are needed for     B.  is needed to     C.  are needed to     D.  is needed for
 
8. Copper as well as most metals____.
A. is a good conductor       B.  is a good insulator
C.  are good conductors     D.  are good insulators
 
9. There used to be some trees by the lake, ____ ？
A. was there     B.  were there     C.  weren't there     D.  wasn't there
 
10. Cattle____ to graze on the village common.
A. are allowed     B.  is allowed     C.  allows     D.  allow