省略 — 英语词汇题
题目
完成句子：每空一词，使用省略结构使句子简洁。1. When ___ (you are) visiting Sarek National Park, remember to carry a tent. 2. If ___ (it is) possible, come and see the fascinating sunset in the park. 3. The guide told us not to feed the animals unless ___ (we were) asked to.