Bài tập chuyên đề Các thì trong Tiếng Anh A. Use the correct form of verbs in brackets

26. A bottle was ________ (throw) outsides last night by him.

27. This fan has already ________ (fix) by my father.

28. Now, a test ________ (do) by him to prepare for his exam.

29. Finally, the key ________ (find).

30. They were very worried that the work would not ________(finish).

The first diagram (31-illustrate)____________the process of cement manufacture, and the second diagram (32-show)_____________ the materials that go into the production of concrete.

It is clear that there are five stages in the production of cement, beginning with the input of raw materials and ending with bags of the finished product. To produce concrete, four different materials (33-mix)______________ together.

At the first stage in the production of cement, limestone and clay (34-crush)____________ to form a powder. This powder then (35-mix)______________ before it passes into a rotating heater. After heating, the resulting mixture (36-grind)_______________, and cement (37-produce)______________. Finally, the cement (38-package)_______________in large bags.

Cement is one of the four raw materials that (39-use)_______________ in the production of concrete, along with gravel, sand and water. To be exact, concrete (40-consist)_______________ of 50% gravel, 25% sand, 15% cement and 10% water. All four materials are blended together in a rotating machine called a concrete mixer.

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