Since then the number of people who were addicted to smoking ________ 20%.[ ]

I can’t believe that there are _____ many poor peoplein ____ a rich country.

More and more high-rise buildings have been built in big cities _____space[ ]

Recently a new social issue has been brought to everyone’s attention _____food additives are abused

So much progress _____ in the past few months that she now has nodifficulty in making herself understood in English.