Now decide what the student should have written: choose the correct form from the three items given. Note your choice on a piece of paper (this exercise is not interactive). The parts of the sentence that need correcting are in red. Only one item per segment is correct.
Missing matter (1) constituate (2) the 90 other per cent. (3) And we don't find them yet.
a) constitutes
b) constituates
c) constitutes
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d) the 90 other for hundred
e) the other 90 per cent
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f) But they haven't been found
g) So it hasn't been found
h) But we can't find it
i) So we haven't found it
j) But it hasn't been found