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 population (人口) and therefore we need more food.
【小题2】We all know that life is not always smooth (平坦的).
【小题3】As soon as I had made the final decision, I felt very relaxed (calm and not worried).
【小题4】How can you afford (have enough money to buy something) such a large house?
【小题5】I like black and red, but my favourite colour is blue.
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解析：
【小题1】句意:我们有一个在不断增长的人口,因此我们需要更多地食物.结合语境及汉语提示,可知填单数名词population,作宾语.
【小题2】句意:我们都知道生活不总是平坦的.结合语境及汉语提示,可知填形容词smooth,作表语.
【小题3】句意:当我做出最后的决定后,我感到非常的放松.本句中feel是系动词,后面接形容词作表语.根据语义提示,可知填形容词relaxed,放松的,作表语.
【小题4】句意:你如何能买得起这么大一所房子.结合前文情态动词can及语义提示,可知填原形动词afford,买得起.
【小题5】句意:我喜欢黑色和红色,但是我最喜欢的颜色是蓝色.结合语境可知填单数名词colour,颜色.