Many clothing manufacturers now substituteartificial silk _____ natural silk to cut down costs of production

Parents will ______ more and more money ontheir children’s education.

I _______home while you ______ the book..

Jack has had no ________experience of this kind of job，but he got the job offer just due to his honesty.

Mike, you look so excited. –Yeah! There____ a basketball game played by Yao Ming this evening.