I saw Tom _____ into the classroom without _____.
Though _______ experience, he managed to get a good position in a big company.
Monkeys in the zoo started to show the flu _______ since last Monday and altogether 20 have died.
---What’s your comment on the match?--- We ________, but today was not our day.
---I wonder what makes you a good salesperson---I _______ as a waiter for three years , which helps my today’s work a lot.
The textbooks ________ for teaching English as a foreign language came out in the 16th century.