New computers are soon out of date since newer models are ________ constantly.
The student’s mind is always _____ when he listens to his teacher.
—Do you know who the young man is beside the door? —A man _____ himself Jason.
—Why did your team lose the game? —They had a big advantage _____ us —— _____ so much taller.
I have done everything _____ was possible to do to prevent him from _____ the risk but in vain.
Now one of the most serious problems many people are worried about _____ on the lack of adequate housing space.