阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Dear fellow students，
May I have your attention，please? Now I'd like to make a speech here．As we know，waste      (become)a common scene on campus recently．Some pour the remains of a meal where there is still much        (1eave)；others     (simple)walk away after washing hands，leaving the water        (run)；students leave the classroom every day      noticing whether fans are switched off．Has thrift(节俭)，one of the national tradition        developed from our long history gone?       so，find it back!
We don't have to take great pains to control waste，but action and a grateful heart are needed；thank the water that runs through our fingers，and save it for poor Arabian or African countries struggling in water       (short)；thank the light we enjoy because in poor areas，children share       dim lamp reading；thank all the paper we are able to use，for trees are cut down      (satisfy)our needs；thank everything nature can offer and everything we can own.
Live and act，so the tradition of thrift will never fade．