I don’t know next.— Let’s ask our teacher for help.

Help yourself ____ some more fruit.

Would you like to stand in front of the door to ________ visitors and guests? [ ]

下列词语中加线的字，每对读音都不相同的一组是(　　)

He likes to play a trick ________ me on the weekend and always begs me to ________ him for hisactions.[ ]