Question

Global warming (a)___________ the phenomenon of increasing average temperature (b)__________ the surface of the earth for the past one to two centuries. Scientists (c)___________ detailed observations since the middle of twentieth century of various weather phenomena like temperatures. They are still doing so. They also (d)________ the related influences on climate. a. (i) was (ii) is (iii) had been (iv) were b. (i) into (ii) in (iii) from (iv) over c. (i) have gathered (ii) has gathered (iii) are gathering (iv) will gather d. (i) studied (ii) studying (iii) study (iv) will study

Answer 1

Answer:

ksnxl

Explanation:

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Answer 2

Answer:

a. is

b. over

c.have gathered

d. studied

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