—Now lots of teenagers spend a lot of time playing computer games.—Yes. Teachers and their parents should prevent them ____________ too much.
—Dad, science is too hard for me. —Oh, dear, if you keep listening ________ in class and do enough exercises, you’ll find it easy.
He’ll remember as many English words as he can ______ the exam.
If you are weak ____ a subject, ______your teacher for advice can help.
—Could I enter the apartment to look for my sister? —Sorry, you ______. Men _______ go into the apartment for girls.
The students _______ their homework carefully when the teacher walked into the classroom quietly.