before
- It won’t be______he______to Taiwan for further study on computer technology.
- It’s quite a time _____ Liu Xiang was injured in the foot, but we are sure it won’t be long _____ he returns to the track.
- Jack, your father has gone out without this umbrella!—Well, take it easy. _________ he comes back for it.
- Never before ________ buying a computer, but now it seems a necessity in my everyday life.
- Though it is
- Though we are not walking slowly, I still think that it won’t be _________ he _________up with us.
- We usually use “an” before a word beginning_____ a vowel (元音音素).[ ]
- Before I talked with ______ scientist, I had never met______ clever person like him.
- Before I watched ____ 3-D film Life of Pi, I had never seen ______ wonderful film like this.
- Before I talked with ______ scientist, I had never met_____ clever person like him.