Tina_____haveknownthetruth,orshewouldhavetoldus.
A、mustn'tWe hadn't met for 20 years, but I recognized her_____ I saw her.
The professor said he could talk on _____ interested the audience.
Many people attend various public lectures, chiefly ______ themselves familiar with the latest development of different fields.
_____ the teacher's suggestion, Tom finally found a way to settle the problem.
Manypeopleattendvariouspubliclectures,chiefly______themselvesfamiliarwiththelatestdevelopmentofdifferentfields.
