Have you considered how weak humans are ____ a volcano, hurricane or earthquake?
On snowy days, you have to drive very_________to avoid traffic accidents.
— You may find the key to the maths problem on page 107. — Ah, it’s so simple. I wonder why I_________of that.
The long and tiring talk, filled with arguments and quarrels, ended in disorder, _________ no agreement at all.
Many people in the city wonder _____the city officials have the information they need to solve the problem.
So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.