根据句意，写出括号内所给单词的适当形式。
小题1:As it was even __________ (fog), it took me longer to get to school.
小题2:The little dog grew up healthily under different mother __________ (wolf) protection.
小题3:I can’t work out the problem __________ (easy) without your help.
小题4:Be careful with the knives, children, or you may hurt ___________ (you).