Thanks to the vivid ______, the speaker made the abstract concept accessible to all the audience.

Most senior high school students are working hard day and night to pass the college entrance examination, gaining ______ to a university.

—Can you hit that bird with your gun, Tom?—No！It is out of the ________of my gun.

I wished to make a round-the-world tour by plane but I hadn't enough money to pay for the ___.

A landing on Mars is within the _____ of current physical theory.