предложения с этими словосочетаниями:
1. a long-term aim
2. to restrict oneself to one chocolate a
3. to unite behind sb
4. to be of no significance
5. it emerged that
6. to be discontented
7. to accept sb's proposal​

1) ?: Was I having supper when you rang me up? -: I was not having supper when you rang me up.
2) ?: Was his mother making dinner in the kitchen, when he came? -: His mother was not making dinner in the kitchen, when he came.
3) ?: Were your friend smoking in the corridor when we saw them? -: Your friends were not smoking in the corridor when we saw them.
4) ?: Was I hurrying to the University when I met Pete? -: I was not hurrying to the University when I met Pete.
5) ?: Were we having our English at 10 in the morning? -: We were not having our English at 10 in the morning.

5. What journal were you reading when I came to the library?

6. The whole family was having dinner when the telephone rang.

7. Where was he going when the rain started?

8. She will be singing over the radio at 5 o'clock tomorrow.

9. They will not go on excursion with us. They are having a lecture at 2 o'clock (запланированное действие - они запланировали быть завтра на лекции).

10. What will you be doing from 2 till 3 o'clock tomorrow?

11. The children were playing when we returned home.

12. Look! It is getting dark. It will be raining in a minute.