1. The celebration is on Sunday
2. In Great Britain Christmas is in December.
3. The English lesson is on Tuesday.
4. It's my sister's birthday on Friday.
3. The test is on Wednesday. I'll have a lot of work at the
weekend
6. The school starts in September.
Объяснение:
1. on
2. in
3. on
4. on
5. on/at
6. in
Объяснение:
"At" используется для точного времени.
"On" используется для дней.
"In" используется для месяцев/лет.