Question

Раскройте скобки, употребив глаголы в соответствующем времени, лице и числе:
It is 10 o’clock. It (to be) very quiet in the University. The lessons (to begin). The students (to work) in their classrooms. They (to work) since 9 o’clock. The bell (to go) in half an hour.

Answer 1

Is,  have begun,  are working,  went.