My brother and I had fun _________ in the river this summer vacation.

—Why do the people decide ______ these days?—Because there’s not much to do. 

I ______ peaceful countryside ______ noisy cities while my sister prefers _____ in the modern cities.

－Last semester, he had a hard time______ English.

.---What do parents in China want their children to do? --- Most parents expect to see their children_____ hard all day.