请根据句意或括号中的中文提示、英文释义，写出句中所缺单词，使句子通顺。 (每小题
题型：听力题
问题：
请根据句意或括号中的中文提示、英文释义，写出句中所缺单词，使句子通顺。
(每小题1分，共5分)
小题1:We have a growing (人口) and therefore we need more food.
小题2:We all know that life is not always (平坦的).
小题3:As soon as I had made the final decision, I felt very (calm and not worried).
小题4:How can you (have enough money to buy something) such a large house?
小题5:I like black and red, but my favourite is blue.