Ответ:
1. on
2. at
3. in
4. in
1. youngest
2. older
3. younger
4. cleverer
1. must
2. must
3. mustn't
4. mustn't
1. are
2. is doing
3. had
4. shall go
1. We always go to in London in spring.
2. We usually stay in a hotel.
3. Our grandparents never come with us.
4. We often go to a restaurant in the evenings.
1. Do you speak English?
2. Sometimes we go to...
3. It rains
4. How often do you have...
1. is singing
2. don't understand
3. am not watching
4. walks