We must________the weather into consideration first when climbing mountains.[ ]

_____–For tow hours.

There’s too much salt in the Chinese diet.—So there is. The WTO says only 1.5 grams of salt_______ for each man every day.

The houses in big cities are very _______. I can’t afford（负担）them.

Look at those clouds!——Don’t worry. _____ it rains, we’ll stillhave a great time.