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The students only go to visit the archeological site ____ now and then

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................. for overall health.

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Kids with dyslexia may have ____ questions about something they've read.

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Total weight of all the ants in the world is much greater than .................

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Polar bears are in danger of dying out. (25) _____ some other endangered animals, it's not hunters that are the problem, it's climate change. Since 1979, the ice cap at the Arctic Circle where the polar bears live has reduced in size by about 30 per cent. The temperature in the Arctic has slowly been rising and this is (26) _____ the sea ice to melt, endangering the polar bears' home. The polar bears' main sources of food are the different types of seals found in the Arctic. They catch them by waiting next to the air holes seals have made in the ice. (27) _____ the bears are very strong swimmers, they could never catch seals in water. This means that the bears really do rely on the ice to hunt. Polar bears also need sea ice to travel. They can cover a huge territory and often swim from one part of the ice to another. They have been (28) _____ to swim up to 100 km, but when there is less ice, they may have to swim further and this can (29) _____ fatal to the bears. A number of bears have drown in the last few years and scientists believe that it is because they were not able to reach more ice before they became too tired and couldn't swim any further

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Be sure to put __________ your campfire before you go to sleep

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They ..... to work independently and become their own masters

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I wish another more effective teaching method______used

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Does your mother _____________ special foods on New Year?

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Poison oak generates irritating poisons ............. even if people merely brush against the plants.

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What are they saying about the art theft is pure ______; nobody knows who did it

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Then you can relax, ____________ a bath and a nice breakfast.

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We should ________ a list of things to do to avoid wasting time

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Look! The cattle ______ on the meadow

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Within an area of only 100 miles, Death Valley sinks to 282 feet below sea level while Mount Whitney ............. to a height of 14,494 feet

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Dreams are something for us to ....... and work for

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Make sure that the needles are sterile

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The ............... system controls the movement and emotion of our body

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Elephants scratch themselves with sticks .................. 

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His wife must have been a saint to put ________________ him for all those years

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Profits have decreased sharply over the past year, which ------- that West River Foods Co. should find better ways to improve productivity