With ______ successful launching of Tiangong-1, China’s space dream has taken ______ step closer to reality.

Over time,    custom of kissing developed as      way for adults to express their love for each other.

Though every parent admits that reading contributes to        better mind of their child, yet let’s face it, who has got       time?

As ________ rule, apples are sold by ______ weight and eggs by _______dozen.

Wang Hao and Chu Yafei led China to______gold and silver finish in ______ 20­kilometer walk，the first athletic event at the Asian Games.
A  a；the    B. the；a    C. 不填；a    D. 不填；the

—I’m going on         diet these days.
—In my opinion, you should have      balanced diet.

In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.

Living in _______ ever increasingly fast-paced world, we are facing greater competition, so we must take _______ advantage of every opportunity to develop.

What      fun it is to walk alone with      full moon hanging in the sky.

By tradition, on __________ Independence Day, Americans play sports, have barbecues and hold parties throughout __________ day to celebrate this festival.