这是省略句,补充完整：
Don't come into the room until you are asked to（come into the room）
因为与前面的句子重复,所以省略了重复部分,但是一定要保留to,从to后面省略请问t's a good place to eat.对，还是 It's a good place to eat at . 对呢？为什么？这里的介词 at 需不需要省略呢？还有: It's a good place to go还是It's a good place to go to?谢谢您！It's a good place to eat at .这是正确的。It's a good place to eat这句话的意思就是 这是一个能吃的好地方，要把地方给吃了。于是at 就不能省略了。表示 在这吃饭。It's a good place to go。这里不需要使用后面的to了，这个我是凭语感。