Rather than _____ on a crowded bus, he always perfers _____ a bike.

I don’t know when my son back, but when he back, I’ll call you.

Liu Xiang has failed over and over again in the past years. And that’s _________ he succeeds.

One of my teammates fell ill _______ he can’t practice with us now. [ ]

The old man lives ____ but he doesn’t feel ____.