Cars do cause people some health problems, in fact far more serious _____ than computers do. 

—-Hurry up! There’s a bus coming!—Why run? There will be __  ___ one in two or three minutes．

--- Why is the cake so expensive?---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice. 

 That region has a lot of natural resources while this one has ________.

At your company there are a few machines similar to      described in this magazine.