The invention of spaceships makes ________ human beings to travel to the moon.
— Don’ t be so naughty! Be your _____. — Got it.
Jack would like to go to the cinema with dad, but the film is____________for adults only.
--- How long are you staying? --- I don’t know.______________.
. In China, a number of people__________English now, and the number __________growing year after year.
. ____________ the dinosaurs disappeared still remains a mystery.