— How much are the two pairs of trousers? — They are not expensive. I think one hundred dollars ______ enough.

The sick in our country       taken good care of by the government.

(2013·高考福建卷)The famous musician，as well as his students，________ to perform at the opening ceremony of the 2012 Taipei Flower Expo.

About one third of the population in Beijing and Shanghai ______ netizens, but in poorest areas, only three or four percent ______ online.

The population in our country ____ very ________. 80% of the population ______ farmers.