Her car broke down on her way to the park.________, she had to ask someone to repair it[ ]

We should do what we can ________ the endangered animals.—Yes, it’s our duty_________ them.

How often do I need to feed the birds?—They ________ food every day，or they will behungry.

______ do you improve your listening skills — I improve it _______ listening to tapes.

ed Hannah many times yesterday evening, but Icouldn’t get through Her brother ________ on the phone all the time!