1 feel that one of my main duties ______ a teacher is to help the students to become better learners.

A. for                  B. by               C. as                D. with

Go back ___ you came from.    A. until       B. where       C. which        D. when

We can surely overcome these difficulties _,___ we are closely united.

A. so far as               B. so long as              C. as soon as           D. as well as

The two rings are so alike that it is difficult to tell one the other．

A．very；to B．much；to C．much；from D．very；from

_______ going to French evening classes twice a week she does yoga on Wednesdays.

A. Because of  B. Except  C. Besides     D. But for

Hurry up, ____ you'll be late.         

A. or                B. and             C. so             D. yet

I know nothing about the young lady ___she is from Beijing.

A. except                     B. except for           C. except that        D. besides

His father will be back from London ____ a few days.

A.since             B.in                              C.on                             D.after

My father was disappointed ____ the news.

A. by                          B. about         C. at                      D. on

The PLA man saved the boy ____ death.         

A. of                B.from             C.to            D.on