The fact has worried many scientists ________ the earth is becoming warmer and warmer these years.

He bought a book with the _____ 50 dollars and then his money ______.

Have you seen my pen bought during my visit to Hong Kong Disneyland?—Oh, Jane must have taken it _________ ; she has the same one as yours.

All the ____teachers and the ________studentsthere are playing basketball on the playground .

I’ll come to see your performance at 9:00 tomorrow evening.— But by then my performance will have ended and I reporters in the meeting room at that time