Miss Li regards all her students _______ her children.

_______ trees have been planted near here, so the air is very fresh.

Do you know the man ________ visited the United States in February?–Yes. He is Chinese Vice-President Xi Jinping. He said it was his ____ visit to the United States.

Don’t forget to take your bag when you ________ the bus.

This exercise is ________ difficult ________. [ ]