III. Supply the correct form of the verbs in the brackets. 21. Mr. Brown just (finish) reading the letter when the telephone on his desk rang. …………………

III. Supply the correct form of the verbs in the brackets.
21. Mr. Brown just (finish) reading the letter when the telephone on his desk rang. …………………….
22. Those students who (fail) the exam are going to take another one held in August. …………………….
23. Hurry up or you (be) late for class. …………………….
24. I (not have) much time for entertainment these days. …………………….
25. Look! A man (run) after the bus. He wants to catch it. …………………….
26. Two robbers who (put) in prison escaped yesterday. …………………….
27. It is 2 years since I (last give) presents on Christmas day. …………………….
28. Nothing (do) about this problem for months. …………………….
29. If it (be not) for your help, I could not have passed the exam. …………………….
30. I wish they (pass) their exam next year. …………………….
IV. Find and correct one grammatical error in each of the following sentences.
31. She will finish her work by lunch time. 32. A number of men disagrees that.
33. The English loves nature. 34. The work has finished in 1998.
35. They meet 5 years ago. 36. They be fond of fishing.
37. Two miles are a long distance. 38. Twenty people are what I need.
39. They agree waiting for us. 40. He volunteered helping the poor.
V. Put one suitable word in the blanks.
A popular theory explaining the evolution (41)……………. the universe is known as the Big Bang Model. According (42)……………. the model, at some time between ten (43)……………. twenty billion years ago, all present matter and energy were compressed into a small ball only a few kilometres in diameter. It was, in effect, an atom (44)……………. contained in the form of pure energy all of the components of the entire universe. Then, at a moment (45)……………. time that astronomers refer to as T = 0, the ball exploded, hurling the energy (46)……………. space. Expansion occurred. As the energy cooled, most (47)……………. it became matter in the form of protons, neutrons (48)……………. electrons. These original particles (49)……………. to form hydrogen and helium, and continue to expand. Matter formed into galaxies with stars and (50)……………..