—How is Helen in the new school?—She is doing very well. There is        to worry about.

 ---Who broke the window?---_____.

I’m moving to the countryside because the air there is much fresher than ________ in the city.

 My visit to your school is really an unforgettable experience,         I will always treasure.

It is a strange phenomenon that some young people today think it is their parents’responsibility to earn money and_______ to spend it.