They looked__________ didn’t know __________ to do.

How did it ____that you missed so good a chance, which was very important for your promotion in the company

I’m sorry I got caught in the traffic；________, I could have been here sooner

Nearly three days after an 8.8-magnitude earthquake, rescuers in Chile were making every effort to _______ possible survivors.

I’d like to ________ him to you for the job. He is a very clever and industrious boy. [ ]