The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
— Sorry, Sir. I didn’t quite follow you. — ______. I’ll explain it to you later.
When you’ve finished school, don’t forget to come back to visit your school, ______?
Humans are destroying nature day by day, ________, of course, will cause punishment sooner or later.
The school _______ I visited the other day was not the one _______ I once studied.
Is this the reason____ at the meeting for his carelessness in his work?