—Do you know how I can ____ him?—On his mobile phone．

They always communicated with each other on the Internet, but they never met him _______. 

---What bad weather! It’s raining all these days. ---Yes, the river has _____ two feet.

Some doctors suggest that vinegar will ____ people from being infected ___ H1N1.

We have a high regard for Mr. Smith because he always tries to _____________his principles.