Don’t disturb me. I ______ letters all the morning and have written ten so far.
The scientists were waiting to see the problem _______.
The foreigner tried his best, but he still couldn't make his point _______ .
People _______ in the city do not know the pleasure of country life.
The _______ price will save you one dollar for each dozen.
The student corrected his paper carefully, _______ the professor's suggestions.