Fill in the correct tense:

1.A:You seem energetic! B:Really, I (exercise) ............ for some time.
2.A:What (you,do) ........... when the robbery took place?
B:I (change) ............. a light bulb that had burnt out.
3.Mike (use) ........... the same PC for more than three years. He is thinking of upgranding it.
4.If it (snow) ............ tomorrow, we (go) ......... skiing near Vesuvis.
5.This is the second pill I (take) .......... to make me sleep.
6.Sam started his business in Spain three months ago. When he returnes to Turkiye next July, he (spend) ......... nine months there.
7.Mary (not,call) .............. me since she (leave) ......... the city.
8.Karen (live) ........... in Hong Kong for more than two years. In fact, she (live) ........... there when the political takeover occured.
9.By the time the police (arrive) ..............., the robbers (run) ........... away.
10.The book writes that the Maya tribes founded an advanced civilization in the forests of the Yucatan, nevertheless, their culture (disappear) ............ by the time Europeans first (arrive) .......... in the New World.
11.Hey. Be quiet! The boss (come) ............ .
12.It (snow) ......... all day. I hope it stops by noon because I wish to go to the market.
13.Listen Ed, I don't care whether you (miss) ........... the bus this morning. You (be) ........ late. This is my last warning.
14.We are fed up with storm and those dark clouds! We expect, when we (wake) ...... up tomorrow morning the sun (shine) ............. .
15.When Hasan arrived at the cafe, I (wait) ........... for him for half an hour.
16. I (not,hear) .............. of the pyramids before I went to Egypt.
17.During the past 50 years, traveling (become) ............. much easier and very comfortable. In the 19th century, it (take) ........... two or three months to cross Africa by wagon. The trip (be) ......... very rough and often dangerous. Things (change) ............ a great deal in the last hundred and fifty years. Now you can fly from Ankara to Tokyo in a matter of hours.
18.Your English (improuve) ........... .You (watch) ....... televison programs and I (study) ........ grammar every day since you first arrived in London. It is apparent than you will be fluent very soon.
19.When Ted (arrive) ............... home last night, he discovered that Hilary (prepare) ........... a beautiful candle-lit dinner.
20.Do not forget that if you (need) ............ to contact me sometimes next week, I (stay) ............ at the Hilton in Istanbul.