– Who did you see playing in/on the playground?
– ________

– How many students did you see playing in/on the playground?
– ________

Of the most popular films in China this year, ________ was produced in this city

To keep our world a clean tidy home, we must not throw wastes ________

– One week’s time has been wasted
– I can’t believe we did all the work for ________

– When shall we meet again
– Make it ________ day you like It’s all the same to me

Few pleasures can equal ________ of a cool drink on a hot day

By , production in the area is expected to double ________ of

代词：人称、物主、反/自身、指示、相互、疑问、不定代词
As they were classmates, ________ was no wonder that they should do the work in the same way

名词与其数和所有格及数词的表达
To become a qualified librarian, she first worked in a public library for a year to get ________ of the work