As a writer, he used to go deep into life to __________ materials for his creation.

You should take advantage __________ this opportunity and try to make a good impression __________ them.

There was a (an) __________ silence between us after we were left alone in the sitting-room.

You will succeed in the end __________ you give up halfway.

__________ to his scientific work, he has no time to care for his family affairs, which his wife always complains about.

__________ the bananas to go bad, he preferred to sell them at half price.

I like the film very much. It __________ me __________ the happiest days when I was young.

As the examination is approaching, Mike makes a(n) __________ that I help him with his lessons.

 - Do you think you could do without help?

- __________. This is not the first time for me.

Most people felt __________ regrettable that Yaoming retired from the NBA. 

A. one          B. this         C. it           D. what