So absorbed ________ in the research that she didn’t hear someone knocking at the door.

I can’t find mydictionary anywhere.— You _____ have lost it while studying in the library.

The professor, ________ his assistants, _______conducting the experiment.

I’m not sure whether I will have anything else to do this evening_____, I will try every possible means to come to your birthday party

I think students should have mobile phones to call their parents at school..—_______. They often use them to play games instead.