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.Manufacturers should have professional productivity and technical knowledge to ______ the quality of the products.

---Do you know what WWF______ ?
----Yes. That’s World Wide Fund for Nature.

In developed countries, farm workers _________ only a small section of the population.

Science and technology __________ nowadays in our socialist construction.

Car dealers also have a tough time in bad economy. Therefore，they have to ________ their business model to overcome the difficulties.

Warm­blooded animals live an active life even in freezing winter，which helps them to ________ their normal body temperature.

Traditionally, Chinese people _______ the Chinese characters Double Happiness and stick them onto walls or doors for weddings.     

To my surprise, at yesterday’s meeting he again            the plan that didn’t sound reasonable.

When you keep your promise, no matter how much effort (努力) it takes, you will be       .

—What shall I do if I meet a word that I don’t know?
—If you can’t guess its meaning, you can            the dictionary.