Use PRESENT PERFECT TENSE or PRESENT PERFECT CONTINUOUS to fill in the blanks:
1. I’m trying to study. I … (try) to study for the last hour, but something always seems to interrupt me. I think I’d better go to the library.
2. The children are playing basketball right now. They … (play) for almost two hours. They must be getting tired.
3. The telephone … (ring) four times in the last hour, and each timeit has been for my roommate.
4. The telephone … (ring) for almost a minute. Why doesn’t someone answer it?
5. It …(rain) all day. I wonder when it will stop.
6. We … (have) three accidents so far this week. I wonder how many more we will have if you keep using the tools carelessly.
7. We … (live) here since last June.
8. My little son is dirty from head to foot because he … (play) in the mud.
9. What’s the matter? Your eyes are red and puffy. I hope you … (not / cry). Oh,now I understand. You …(peel) some onions.
10. Hello, Rob. I’m happy to see you again. I …. (not / see) you for weeks. What … you … (do) lately?
11. I … (not / be) able to reach my boss on the phone yet. I … (try) for the last twenty minutes, but the line …busy.
12. We … (have) three major snowstorms so far this winter. I wonder how many more we will have.
13. I … (write) them three times, but I still haven’t received a reply.
14. A: Dr. Harrison is a good teacher. How long … he … (be) at the university?
      B: He …(teach) here for almost 25 years.
15. A: What are you going to order for dinner?
      B: Well, I … (have / have) pizza. So I think, I’ll order that.
16. My uncle … (paint) the outside of his house for three weeks and he’s still not finished.
17. The Smiths are presently in Tunisia. They … (travel) throughout North Africa since the middle of May. They’ll return home in another month