Fill in the gaps with the verbs could, may, must, have to, should and the appropriate infinitive 1)Einstein’s theory predicted that the universe was not static, but (be) either expending or contracting.
2)Because the universe is expanding it (cool), which means that it (be) much hotter when it was young.
3)Therefore, a significant fraction of the universe (consist) of non-baryonic matter.
4)There were no longer free electrons to absorb and scatter light, and photons (travel) freely through the universe.
5)These fluctuations (cause) by something that happened even earlier.
6)We , however, (be) careful about taking these models too seriously; they all (be) wrong.

1. Helen  invited her classmates to her home last Monday. They had a good time together.

2. Have you bought any Christmas present? - Not yet.

3. Tom  has already been to the library. He is reading a very interesting book.

4. Alice  collected English and German coins last year.

5. I  have  done my homework. I can go out with my friends.

1. Do you like the salad? I have made it myself.

2. When you look in the mirror, you can see yourself.

3. Mrs Wilson told her children, “Look at yourselves .in the mirror!”

4. I like Mary’s dress. Did she make it herself?

5. He looked at  himself in the mirror and laughed.

6. We didn’t like the party. We didn’t enjoy ourselves.

7. Jack, you will enjoy yourself if you travel by train.

8. Thank you for a nice day. I have enjoyed myself

9. “I can*t tell him the truth now,” she said to herself.

10. All the people were enjoying themselves.

1. Helen invited her classmates to her home last Monday. They had a good time together.

2. Have you bough any Christmas present? - Not yet.

3. Tom has been already to the library. He is reading a very interesting book.

4. Alice collected English and German coins last year.

5. I have done my homework. I can go out with my friends.

возвратные местоимения.

1. Do you like the salad? I have made it myself.

2. When you look in the mirror, you can see yourself.

3. Mrs Wilson told her children, “Look at themselves in the mirror!”

4. I like Mary’s dress. Did she make it herself?

5. He looked at himself in the mirror and laughed.

6. We didn’t like the party. We didn’t enjoy ourselves.

7. Jack, you will enjoy yourself if you travel by train.

8. Thank you for a nice day. I have enjoyed myself

9. “I can/t tell him the truth now,” she said to herself.

10. All the people were enjoying themselves .