There are 5 _______ in the passage about nanometer(纳米)technology we have just read. Please tell me the general meaning of the first one.
.---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.
--- Have you telephoned your father ? --- Yes. He _____ back next year.