In recent years, the ______ dry heat had led to a series of natural disasters.

His wife is ________ finding fault with him, which makes him very angry.

___ the fact that he found math boring, he was still good at it.        

Food safety is ________ important, so our government spares no efforts to prevent food being polluted.

His parents，_________，did not look after him very well—the elbows of his jacket were patched and his boots were badly worn.