4Fill in the correct preposition 1. Three points this analysis must be added.
2. This account scientific procedure is not wrong.
3. this period there seems to have occurred an important event in the field.
4. Priority arguments were invented independently Friedberg.
5. I have tried to highlight the difference the two objects.
6. Several charges Lowe have been raised.
7. A somewhat similar approach has been developed Kamp’s recent work.
8. Evidence for the Big Bang hypothesis has been accumulating two decades.
9. Information the volume of reservoir is required.
10.One way of obtaining hydrogen is to pass electric current water.
11.Newton’s laws of motion may be subjected criticism.
12.We were informed that a new idea had been advanced the closing session.
13.An approach this sort will be presented here.
14.They have been dealing this thorny problem for many years.
15.The result of the experiment is shown Fig. 5.

5 Choose the correct item
1. They that they had completed the task.
a. have reported b. report c. are reporting d. reported
2. By the time we arrived, the conference already.
a. will begin b. has begun c. had been began d. had begun
3. It is necessary that they the book.
a. are publishing b. published c. publish d. will publish
4. All contributions by a board of reviewers next month.
a. were revised b. will be revised c. are being revised d. will revise
5.Weekly seminars to discuss the appropriate application of biotechnology.
a. are designed b. designed c. to be designed d. designing
6. If the metal heated, it would melt.
a. are b. were c. had been d. is being
7. An attempt to find a pattern of consistency in all observations of the system under study.
a. made b. are made c. be made d. is made
8. I him for many years.
a. have known b. know c. have been knowing d. am knowing
9. The scientists made the suggestion that electrons around the nucleus.
a. spinned b. will spin c. are spinning d. spin
10. They how to operate the equipment last month.
a. are shown b. will be shown c. have been shown d. were shown