In case of emergency, whether knowing how to apply first aid or not really ________ in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.[ ]

The shirt looks very nice. I guess it is _______ 100 yuan.

The car is expensive he cannot buy it．

The conventional viewthat the Mars’ atmosphere is very poor because the planet lacks a magnetic field.

The air in Taizhou is getting ________ cleaner now than a few years ago.