_______ is the girl—She’s my friend, Helen.

The next generation of telescopes will reveal（显露；揭示）new parts of our universe that will seem surprising, just as the moon’s craters（坑） when observed 400 years ago．

It is five years ____ he lived here.In other words, he left here five years ago

It seems difficult tohurt from injure in meaning.

Did you do __________ on vacation —Not really. I just stayed at home and helped mom.