The two sentences express contradictory ideas. Hence conjunctions like 'though' can combine the sentences meaningfully. 'Despite being ... or Inspite of being' ... can also be used to express the same idea.

Both the sentences talk about the same person. One qualifies the other. The conjunctions 'so ... that' and 'too ... to' can be used to combine the given sentences meaningfully. But B begins with 'if' and hence is incorrect.

The second sentence ascertains or affirms the first statement. Hence starter A, which uses 'that', is the best way of combining these sentences. The use of 'although' or 'unless' distorts the meaning.

The reason for the security being tightened is because of the increase in the incidents of violence. This is conveyed in A and B.

Both the sentences state the quality or characteristics of the dog. Hence 'and' and 'besides being' can be used to express the idea without any distortion. But the sentences do not suggest the idea that the dog is a 'loving pet since it is a faithful animal'. Hence starter B is inappropriate.

Sentence 2 gives additional information which indicates the purpose for the telephone call. Hence 'in order to' 'so that' 'to' can be used to express the idea effectively. The use of 'while' is illogical.

Though he has lived in France for eight years he has not learnt French. This idea is best brought out using the starter B. The other two starters do not convey the same idea.

Only 'C' which presents a condition is correct. A and B denote a contradiction.

Sentence 2 gives the reason. Hence conjunctions like 'as' 'because', 'for', 'so that', can be used to convey the meaning effectively.

'C' is not correct because the words 'apart from' mean 'in addition to'.