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

My hair is long but       is short.

–Which basketball player do you like best, Kobe, James or Jordan? -- _______ of them .Lin shuhao is my favorite.

Reading more helps ________ learn better.

I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.