5. I will take some clothes to change and cleaning items.
我會帶些換洗的衣服和洗漱用品。
還能這樣說：
I will bring some spare clothing and cleaning items with me.
I am going to travel with some clothes and cleaning items.
應用解析：
item 項目，條款；一則；
item by item 逐條，逐項；
item on the agenda 議程項目
6. Pack some necessary medicine in your carry-on.
在行李箱內放些必備的藥品。
還能這樣說：
Bring some necessary medicine with you in your luggage.
Put some medicine which is in need in your luggage.
應用解析：
if necessary 如果必要的話；
be necessary 必須；有必要；
daily necessaries 日用必需品；
necessary condition 必要條件；
reasonable necessary 合理需要
7. Before traveling I need to buy a suitcase.
在旅行之前我需要買一個手提箱。
還能這樣說：
I need a suitcase before I go to travel.
I should buy a suitcase for this travel.
應用解析：
live out of a suitcase 過居無定所的生活；在旅行中過日子
8. How much money will you have with you?
隨身攜帶多少現金？
還能這樣說：
How much money will you take?
How much cash will you equip with you?
諺語：
Money doesn't grow on trees.
掙錢是不容易的。