Don’t do homework and listen to MP4 player ________.[ ]

Have you returned the book to the library _______? –Yes, I have ____ returned it.

Isoxygentheonlygas______helpsfireburn? [ ]

If you have the chance，which dress will you choose ?—I can’t decide．Maybe the second one is _______________ the two．

____ is it from your home to the bookstore?— About 10 minutes’ ride. [ ]