I was wondering what to do with my car which won’t start ________ a kind man offered to help

_______, our world is becoming smaller and smaller, like a village because of the Internet and easy transport.–Yes. You can have breakfast in a Shanghai street but eat dinner at a New York restaurant.

―Excuse me, Sir, but could you tell me how to go to the railway station?―Sorry. You’d better ask, I’m afraid, ______ is a native.

____ in wet sand, the vegetables can ______ fresh for a long time.

填入下面一段文字横线处的语句，最恰当的一句是 （ ）血栓闭塞性脉管炎又称“脉管炎”，虽是一种血管的炎症，但并不是细菌感染引起的的，而是血栓阻塞血管、血流减少所致，主要以下肢为主。脉管炎后期可引起手足发黑、坏死。但 ，如果在早期能明确诊断，及时治疗，可以避免发生严重的后果。