_________a reply, he decided to write a sixth letter.
Peter is really ____; I don’t think I will get ____ working with him in the same office.
House prices keep rising these days. A flat in our city costs ____ now as in 1990.
Make sure that the machine is kept where it is not ____ to children.
Mary is the only one of the students in our class who ____ to the Great Wall so far.
Two years ago, the 9-year-old girl set up ___ organization named Angel to help ____ homeless.