Now that he'd done it, Oliver Meek found the thing he'd done hard to explain. Under the calm, inquiring eyes of Mr. Richard Belmont, president of Lunar Exports, Inc., he stammered a little before he could get started. "For years," he finally said, "I've been planning a trip...." "But, Oliver," said Belmont, "we would give you a leave of absence. You'll be back. There's no reason to resign." Oliver Meek shuffled his feet and looked uncomfortable, a little guilty. "Maybe I won't be back," he decla