实验室欲配制50g质量分数为5%的NaCl溶液，该实验的主要操作步骤是 ___ 、 ___ 、 ___ 、 ___ ．该实验所需的水的体积为 ___ mL．若量水里读取读数采用仰视，则导致所配溶液溶质的质量分数____，（填偏大、偏小或不变）

小题1:What strange _______________(suggest) you have offered!

小题2: Five         (nine) of the people at the conference come from European countries.

小题3: The house ____________ (it) is not to my mind, but I like its environment.

小题4:My head teacher does everything_______ (patient) while she is in a good mood.

小题5:There are some things that you can’t change, like your       (身高).

小题6:The seats have no back ___________ (紧靠着)which to lean.

小题7:A space sleeping bag is used to be fixed to the walls to prevent_________________(漂浮).

小题8:We must do something to deal with the ____________ (污染) water, otherwise, the fish will die.