41.   Q. What are the electronic devices used to keep pigeons away from The Ballpark in Arlington?

42.   Progress ships are used to keep the Mir station in orbit.

43.   Since the beginning of time, sumptuary laws, a sense of appropriateness, fashion and price have been used to keep parvenus in their place.

44.   Several techniques are used to keep things looking right.

45.   She said carpet experts, the threat of jail sentences and confiscations are used to keep Iranian carpets out.

46.   Some celebrity references used to keep us smiling are too obvious.

47.   Some of the first money was used to keep insolvent banks afloat, simply prolonging their bad-loan problems.

48.   Symington has kept the pressure on the interior secretary just as Babbitt used to keep the pressure on Cecil Andrus and James Watt.

49.   Such arrangements are commonly used to keep land holdings within an extended family.

50.   That trick is also used to keep users connected to one site, even if they are looking at another.