________ modeling business is by no means easy to get into, the good model will always be in demand．

A．While

B．Since

C．As

D．If

－Can I get you a cup of black coffee?

－Thank you, but I prefer white coffee to black ________．

A．one

B．that

C．不填

D．ones

I bought a nice present for my daughter's birthday and she liked ________ very much．

A．it

B．one

C．that

D．those

－Why don't we take a little break?

－Didn't we just have ________?

A．it

B．that

C．one

D．this

My teacher often said in class,“One should love ________ country．”

A．one's

B．their

C．its

D．her

Four policemen rode past on their motorbikes, then came the television broadcasting car, and ________ the marathon runners．

A．at the last

B．in the end

C．finally

D．to the final

Although he is considered a great writer, ________．

A．his works are not widely read

B．but his works are not widely read

C．and his works are not widely read

D．still his works are not widely read

________ the problem is rather hard, ________ the boy worked it out all by himself．

A．Although ;/

B．Though; but

C．Although; but

D．Though; and

It was not until 1920 ________ regular radio broadcast began．

A．while

B．which

C．that

D．since

It was because of bad weather ________ the football match had to be put off．

A．so

B．so that

C．why

D．that