根据句意、释义或中文提示,写出句中所缺单词，使句子通顺。
（1）His parents are angry at his school work. They can't see his ____  (进步)after each exam.
（2）I don't know ____  ( if ) I will have time to join in some activities at school.
（3）Sometimes, I want to ____  (say that you will not do something) to do so much homework.
（4）Orange and yellow are warm colours, they can give you a happy and ____ (满意的) feeling.
（5）Peter is doing an ____  in the laboratory now.

攀枝花市所在省区的省级行政中心是（    ）

已知a=${\left(\frac{1}{5}\right)}^{-\frac{1}{2}},b={\log }_5\frac{1}{3},c={\log }_{\frac{1}{2}}\frac{1}{3}$，则a，b，c的大小关系是（　　）

下列关于生物和生物圈的叙述，错误的是（　　）

如果水位下降3m，记作-3m，那么水位上升4m，记作（　　）