________you want to improve your oral English, you should start speaking English every day[ ]

We think Betty the best student. The sentence structure is ______.

The machine has been used for man years. It’s no wonder that it doesn’t work well __________.

Parents should pay attention to areas _______ their child is having difficulty and spend extra time to help him or her master those skills

Thousands of foreigners were _________ tothe Shanghai World Expo the day it opened.