be back ___ one’s feet恢复;完全复原
He stayed under water for two minutes, and then swam to the __________(表面).
The young scientist is __________(怀疑)about the theory.
You are easy to be __________(攻击)when you are in red in the forest.
他从踢足球中享受到了极大的乐趣。He __________ __________ __________ __________ __________ playing football.
__________(自然地),I get worried when things go wrong.