Here are the completed sentences and corrections:

1. The English **are** famous for their calmness.
2. The money that **is spent** on education every year **is** not enough.
3. The number of employees who **have not finished** their work yet **have** to work on the weekend.
4. The office **is closed** on the weekend.

Ex7. Correct the sentences if necessary. Check (√) any that are already correct:

1. The Chinese **have** an interesting history.
=> The Chinese **have** an interesting history.

2. English is one of the most popular **languages** in the world.
=> English is one of the most popular **languages** in the world.

3. The scissors on the table **are** my sister’s.
=> The scissors on the table **are** my sister’s.

4. Linguistics is my major field of study.
=> Linguistics is my major field of study. (√)

Let me know if you need further assistance!