42. I can't get my boots _____. They are too tight.
____ most efficient way to understand thousands of new words is to gain ____ good knowledge of basic word information.
– I’m sorry to have broken your pen. I wasn’t on purpose.––_______. I’ve got another one.
The news has spread all over the country ____ the spaceship succeeded in returning to the earth.
____ he works hard, I don’t mind when he finishes the experiment.
____, he does not know the answer.