The maths exam was rather difficult；to our joy，________students passed it.[ ]

The boss said we had only three days to finish the work. — Don’t worry. We have already _____two thirds of it.

Recently I have bought an iPad on the website of taobao.com, _______ the price is very reasonable.

he _____ planning is an essentialnational policy of our country, which encourages each couple only to bear onechild.

He worked hard at school, ____ leads to his success in his later life.