3.15. After a heated discussion, they finally agreed on the price the new car.

A. 　 ridden

B. 　 flew

C. 　 been

D. 　 gone

A. 　 either

B. 　 or

C. 　 for

D. 　 and

A. 　 by

B. 　 on

C. 　 in

D. 　 for

A. 　 having cried

B. 　 cry

C. 　 to cry

D. 　 crying

A. 　our

B. 　 you

C. 　 mine

D. 　 yours

A. 　不填;a

B. 　 a; a

C. 　 the; the

D. 　 the;不填

A. 　 interested

B. 　 interests

C. 　 interest

D. 　 interesting

A. 　 On

B. 　 For

C. 　 By

D. 　 With

A. 　 in

B. 　on

C. 　 by

D. 　at