The role of scientists is to observe and describe the world.

A. Don’t

C. to stay up

D. late

A. education

B. educate

C. educational

D. educator

A. their children’s making a lot of money in the future.

B. one day seeing their children become famous people.

C. one day living on their children’s money.

D. a bright future for their children.

A. warned

B. travel

C. the

D. by

A. The rain

B. for

C. climbing

D. top of

A. I would like express our thanks for receiving the donation.

B. I would like expressing our thanks for receiving the donation.

C. I would like to express our thanks for receiving the donation.

D. I would like to express our thanks for receive the donation.