What do you usually do _____ your computer? —I usually chat _____ QQ friends online. [ ]

There are many hills in the country. A train usually goes ______ tunnels.[ ]

There was __ a long line at the movies___we had to wait for along time before we could get in.[ ]

I’d like to eat these candies. They taste _________.

Afer class, I play ping-pong with my classmates.