over the moon: vui sướng, hạnh phúc 

once in a blue moon: hiếm khi, ngàn năm có một 

out of this world : tuyệt vời 

the sky's the limit: chẳng có gì là giới hạn 

1. the sky's the limit    2. over the moon   3. once in a blue moon   

4. out of this world   5.  the sky's the limit   6. out of this world

2. Complete the sentences with the idioms in the box. Some idioms can be used in more than one sentence.

1. The sky's the limit

2. over the moon

3. once in a blue moon

4. out of this world

5. the sky's the limit

6. out of this world

3. Choose the best answer using what you have learnt about life aboard the International Space Station (ISS)

1. rinseless shampoo

2. don't always

3. do experiments

4. communicates with

5. packaged

6. like