1.Are you doing a test?
2.Is your teacher sleeping?
3.Are your friends studying?
4.Is it raining today?
5.Are your classmates singing?
6.Is your dad working?
1. <span>I saw him putting the file into his briefcase and leaving the office.
</span>2. <span>He prefers to be on his own now.
</span>3. <span>You rely on your parents far too much. You'll have to start doing things for yourself – they can't do everything for you.
4. </span><span>Hotel bills have to be paid on the day of departure.
</span>5. <span>The customs officer made me open my suitcases.
6. </span><span>We noticed him entering the building carrying a huge bag.
7. </span><span>I suggest buying a second-hand car for the time being.
8. </span><span>Let's try to mix these ingredients and see what happens.
9. </span><span>I once tried to bake my own cake but it was a disaster.
10. </span><span>Would you prefer to think about our offer and phone us in a couple of days?
11. </span><span>She heard the clock striking two before she went to bed.</span>
1) <span>World Wide Web is older that YouTube
2) </span><span>Skype is older than Twitter </span>