Susan, can you help me clean the window—Why_______ Alice is sitting there doing nothing.

ou like a house with no garden　—________. But anyhow, it’s better to have one than none.

Check your paper carefully to see ________ you have made any mistakes

The Smiths consider ______ a computer, which is commonly considered ______ a great help in our work and study.

Studies show that students are more ______ to be addicted to playing computer games if they always play them before computer screens every day. [ ]