根据句子意思及汉语提示，写出所缺的单词。

1．I can't find my key now．I am always            （丢）things these days．

2．It is good for us to eat             （健康的）food．

3．My             （知识）of geography is poor．Will you help me with it?

4．When Lily arrived，Alice was sitting              （舒服地）in a big chair．

5．I love Christmas! I receive many            （礼物）at Christmas．