A lot of foreigners__________ familiar with the famous places of interest in China．

All the scientific evidence        that increasing use of chemicals in farming    damaging our health.

Every means _____ prevent the water from _____.

The number of the people who can afford to buy their own house ______ more than 60%,but a number of houses _______.

-I called you at 2:00pm yesterday, but there was no answer.-Oh, sorry! I __________ in the garden at that time.