JAPAN AND CHINA have agreed on a visit to China this year by Japanese Prime Minister Toshiki Kaifu that would end Beijing's isolation since its 1989 suppression of the pro-democracy movement, a Japanese official said Saturday . . . A BUS carrying 51 passengers plunged off a five-mile bridge into South America's largest lake, killing at least 33 people, a national guard official said Saturday. The national guard official and other witnesses said the bus was traveling too fast across the bridge over giant Lake Maracaibo, 435 miles west of Caracas, Venezuela's capital.