His family are worried about him because they haven’t _____ letters from him for a long time.
Our monitor always helps other students ____ their lessons and he never says any bad words _____ others.
Students in the USA spendtime their homework than we do.
Chinese students have _________ weeks ______the summer holiday than American students.
.We can do the work better with _____ money and ____ people.
We will have a __________test next week.