用方框中所给动词短语的适当形式填空

compared with ,catch up with,  protect…from, at once,  have to

If anything happens to him, let the doctor know________.
___________ my father’s handwriting, mine is poor.
My mother is ill. I______________ stay at home.
Danny saw Jenny walking on the sidewalk in front of him. He ran to __________her.
The volunteers make great efforts to ________the animals______ going extinct.