It is well-known ______ a person, especially the old, eats too much he’ll feel uncomfortable

How did you get in touch with the travel agent, Robin?—Oh, that’s easy. I surfed the Internet and then called one ________ the telephonenumber is provided.

______ in a heavy traffic jam is quite an unpleasant experience.

What are you doing—I’m looking ___ the children. Theyshould be back for lunch.

I’m sure we can find a way to ________ the problem.