Now more and more people prefer _____ to_____ inorder to reduce the air pollution.

Mary is a humorous and warm­hearted woman and that is ________ she is a most popular person in her community.

If you have any trouble________the work within the time, please tell me. [ ]

You can come ______ on Tuesday _______ on Friday, but whichever you choose, please let me know

Do you mind if I sit here — __________ It’s for my friend Cindy.