Sometimes I keep my feelings to myself       it’s hard for someone else to understand.

He is determined and competent and intelligent as well, which is ________ it takes to become ______success.

How can school ban mobile phones completely __________ some of the parents simply don’t follow the rule?

If a lot of people say a film is not good, I won’t bother to see it, or I’ll wait _____ it comes out on DVD.
A.whether           B. after            C. though               D. until

____________for children, the album became popular with parents __________it came out.

_____you have to do the job, you should try your best to do it well  even though it may be very difficult for you.

He had just reached home _____ a man called to see him.

Jerry has promised to keep the secret, so he won’t tell anyone _____ asked to.

A total of 548 students fell ill ______ consuming milk and biscuits in schools in Northwest China's Qinghai province on Wednesday, local authorities said.

Some house plants grow better if placed near a window with plenty of sunlight ______ others prefer to be in a more shaded spot.