Mary often does some translation work to earn extra money, which ________ half of her income. [ ]

Man-made-satellites______ into space bymany countries

To improve the quality of our products, we ask ____ has used them for suggestions.

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ___________ we should deal with properly.

If your race car isn’t insured, you maylosing everything when it hits something solid．