The experts were doing their experiment in the lab, ______ what happened outside. [ ]

ving up when meeting with difficulties is a good quality, ______ you can benefit from.

The Voice of China is very popular , lots of peoplelove to _________ to watch it.

The writer was so _______ in her work thatshe didn’t notice him enter the room.

Does anybody want an extra ticket to go to the movies? —Whom would you rather _______ with you, Li Hua or me?