The problem of ________ become a serious one．

A．dealing with waste plastics have

B．deal with waste plastics have

C．dealing with waste plastics has

D．to deal with waste plastics has

He wrote a story ________ a real one．

A．basing on

B．based on

C．to base on

D．being based on

My spoken English has improved greatly ________ my teacher and classmates．

A．under the help by

B．after the help from

C．with the help of

D．from the help of

No permission has ________ for anybody to enter the building．

A．been given

B．given

C．to give

D．be giving

Can you believe that in ________ a rich country there should be ________ many poor people?

A．such; such

B．such; so

C．so; so

D．so; such

My dictionary ________．I have looked for it everywhere but still ________ it．

A．has lost; don't find

B．is missing; don't find

C．has lost; haven't found

D．is missing; haven't found

－________ leave at the end of the month．

－I don't think you should do that until ________ another job．

A．I'm going to, you'd found

B．I'm going to, you've found

C．I'll, you'll find

D．I'll, you'd find

Don't sit there ________ nothing．Come and help me with the table．

A．do

B．to do

C．doing

D．and doing

I'm certain David's told you his business troubles, ________, it's no secret that he owes(欠)a lot of money to the bank．

A．However

B．Anyway

C．Therefore

D．Though

－How about seeing the new movie at the theatre tonight?

－________, but I've got to go over my notes for tomorrow's exam．

A．All right

B．Sounds great

C．I can't

D．No, I am terribly sorry