As Susan stared at ______ piles of plastic in her recycling bin, ______ strong sense of responsibility made her stick to her recycling work.
---Has Tom finished his composition yet? ---I have no idea, he _____ it this morning.
.---Why were you not at the concert last night ? ---Oh.I ______ for a friend from Europe at the airport.
Many new workers _____ trained and in two months they will _____ to build a new railway.
.I thought I was going to fail the exam, but I succeeded _______.
- What were you up to when she dropped in ? ---I _____ for a while and ____ some reading.