Complete the following sentences with the present perfect or past simple.   1. Sam   … ….. a new cell phone a few months ago. ( buy )   2. I didn't know that he bought a new cell phone. Yes, he   …………. it for a few months now. ( have )   3. Last year we   ………………. to Scotland for our holidays. ( go )   4. You look relaxed! Yes, I   ……………… on vacation. ( just  been)   5. I can't join you now because I   ………………… ….. my homework yet. ( not  do)   6. I   ………………… all my homework yesterday afternoon. ( do )   7. I   ……………… …. very  well the last nights. ( not  sleep)   8. Are you tired? Yes, I   ……………………… a hard day. ( have )   9. Here is the news. There   ………………. an accident on the M1 near Nottingham. ( be )   10.  I   …………… ….. my keys.  Did you take them with you this morning? ( lose )   11.  Tom   …………………… in Sydney all his life.  ( live )   12. How long   ……………. out last night? You look tired. ( you  stay)   13.   …………….   an accident?  No, never. ( you  ever have)   14. My sister is going to Italy in the summer. That's why she   ……… ….. to study Italian. ( start )   15.  I   ……… ….. a cold last year.  ( not  have)