51.   But a person who prefers to keep windows open might find a wired system inconvenient, since it usually operates only when all entries are sealed.

52.   But at night, if you keep your windows open, you can still hear the gulls and the harbor bells.

53.   But doors, too, must be kept open.

54.   But anticipating objections from Democrats, he kept open the possibility that Congress might have to work over the weekend.

55.   But he kept open the possibility of speaking out against capital punishment from the House floor.

56.   But his willingness to keep open the possibility of releasing some details seemed to be an effort to assuage Republicans on the panel.

57.   But his willingness to keep open the possibility of releasing some details seemed intended to assuage Republicans on the panel.

58.   But in every possible way, I want to keep it open.

59.   But it was such a success that the museum trustees decided to keep it open.

60.   But moderate members of his government, lead by Foreign Minister Shimon Peres, want to keep lines open to negotiation with the Palestinians.