1.Thousands of people visit the zoo every week (every week- маркер времени)
2. At the moment the monkeys are having lunch (at the moment - маркер времени)
3. They usually eat at two o'clock in the afternoon. (usually- маркер времени)
4. The wolves are sleeping now (now- маркер времени
5. Wolves don't sleep at night. (они всегда(!) не спят ночью - маркер времени)
6. What are the tigers doing at the moment? (at the moment-маркер времени)