Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
The _______ are ten to one that we’ll win the match.
He had no choice but to _________ an excuse to explain his being late.
The old man said the accident ____careless driving, so a lot of money_____be paid by the driver.
The news has spread all over the country _____ the spaceship succeeded in returning to the earth.
I’d rather have a room of my own, however small it is, than ___ a room with others.