Câu hỏi:

Choose the letter A, B, C or D to complete the sentences

Space __________ is the main vehicle for astronauts to travel on the Moon.

Choose the letter A, B, C or D to complete the sentences

Our lives are in __________ because of pollutions

Choose the letter A, B, C or D to complete the sentences

Scientists think it is possible to send humans on a __________ to Mars by the 20130s.

Choose the letter A, B, C or D to complete the sentences

There have been some traces proving the __________ of aliens.

Choose the letter A, B, C or D to complete the sentences

Have you ever seen a flying __________?

Choose the letter A, B, C or D to complete the sentences

“What subject do you find the most difficult?” My mother asked.

⇒ My mother asked what subject ____________ the most difficult.

Choose the letter A, B, C or D to complete the sentences

It was so kind of him __________ me when I was homeless