Li Ming is in poor health. He should pay more attention _________ exercise.
People in Britain say “lorry” while people in the USA say “____”.
Millie often helps Sandy _______ her Physics, and she also shares his school things _______ her.
China is one of ______ countries in the world.
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.