Раскрыть скобки в двух предложениях
7. Some seats in the Strangers’ Gallery just (to reserve) for the Russian business people. They (to be going) to visit the House of Commons tomorrow.
8. After the purpose of the meeting (to explain) to the participants they (to invite) to the conference hall.

7. Some seats in the Strangers’ Gallery have just been  reserved for the Russian business people. They are going to visit the House of Commons tomorrow.

8. After the purpose of the meeting has been explained to the participants they were invited to the conference hall.