By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.

---Good evening. I _______ to see Miss Mary.---Oh, good evening. I’m sorry, but she is not in.

 Ever since Daming graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company. 

—Why were you so late this morning? —I _____ in heavy traffic for an hour on the way here.

When she entered the police station, she recognized the man who ______ her at once．