请家长朋友大概了解词源:From Middle English present， from Old French present， from Latin praesent-， praesens， present participle of praeesse ， from Latin prae- + esse .
if we take short breaks__.19. Food in small pieces could be eaten easily from the sun twigs which_ turned into chopsticks.20. Walls make of adobe take in the heat from the sun on hot days and give out that heat_ during cool nights， thus warning the house.21. …
