1. 45% of ........... click on Internet dating sites are married, ........... recent survey.
a) the ones that - accordingly to
b)those who - according to
c)those which - according the
d) these of which - according a

To my mind - b is correct

2 .........,files on your hard drive ........... fragmented, .............. error messages or crashesh.
a) over time - may become - producing
b)With time - could become - to produce
c)After time - can be - in producing
d) In times - might be becoming - producing

To my mind - c is correct answer.

3.Many students ........... only a credential, not ..........., and cheating has become a widespread practice.

a) search for - educating
b)seek - education
c)seek - an education
d)search - the education

May be the correct answer is b

4. The EU Commission has ......... its intention to continue ........... butter.

a)signed - purchasing the
b)signalled - to purchase
c)been signalling - into purchasing
d)been signing - purchasing

According to me the correct answer is a

5. ............. the last eight weeks of the ewe's pregnancy,unborn lambs ............. 85% of their final birth weight.

a)in - put up
b)over - put to
c) throughout - put
d)during - put on
To my mind the correct answer is a
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Comments  (Page 2) 
Finite verbs are inflected for tense, person or number; nonfinite verbs are not. Nonfinite verbs are the infinitive (to do), and the unaccompanied 'ing' and 'ed' forms. What we are actually concerned with here, however, are finite and nonfinite clauses (i.e. those including finite and nonfinite verbs, respectively). (A nonfinite clause can also have no verb)

Finite clauses: Bob woke up in Toledo; I am making peanut butter sandwiches for breakfast; [the broom] that had been standing in the corner [now made a rush for the door].

Nonfinite clauses: To meet a nice girl [is every man's dream]; standing in the corner, (I at last experienced satori); seated on a velvet cushion, [the dog looked amused]; under the weather, .

You can find more explanation and example by googling 'finite verbs', 'finite clauses', 'nonfinite verbs' and 'nonfinite clauses'.
Maybe I understand you !
Finite verbs concerned the subject that's why in one sentence we cannot use two finite verbs we have to use finite and nonfinite verbs.
Students: We have free audio pronunciation exercises.