We must______ using plastic bags in order to protect our earth..

What’s _______number of school in the city? —–I’m not sure ,but I know there must be _______ number of schools in it.

How was the English evening party last night?-It was great fun. You ______ come.

Who has ____ marks in English，Wang Lin，Zhang Fang or Li Hong?一Li Hong．

It’s said that Singapore is really a beautiful country. I’m considering _______ it.