67
10.
All sciences are closely … .
A. investigated B. unified C. explained
D. interconnected
2. Fill in the blanks with the proper grammatical forms.
1.
The experiments … by him.
A. has been done
C. have been done
B. were been done
D. have done
2.
The scientists … a wide variety of subjects.
A. were studied
C. has studied
B. have studied
D. are studied
3.
The cell structure of the plants … by the scientists.
A. has been examined
C. have examined
B. has examined
D. had examined
4.
… they already solved the problem?
A. Are
B. Have
C. Do
D. Is
5.
… he made observations?
A. Have
B. Is
C. Does
D. Has
6.
This theory has … a part of scientific knowledge.
A. become
B. became
C. becomes
D. been become
7.
Scientific knowledge has … greatly.
A. grow
B. grown
C. grew
D. grows
8.
All branches of science … closely interconnected.
A. have
B. has
C. are
D. had
9.
The tools and machines … our life and work easier.
A. makes
C. have made
B. have been made
D. are made
10.
Since ancient times people … tools and machines.
A. have invented
C. are invented
B. invented
D. invents
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