@aban
سوال 4) If the answer is no.1, the sentence will be translated like this: "They CLAIM that he HAS an influence on many other chefs; but here we cant see the present form of the sentence, so I think choice no.3 fits better
سوال 5) If yu read the sentence once, choice no.3 fits the best since the sentence must be in passive voice :face_with_tears_of_joy:
سوال 6) Its very common to use the structure Has been, so choice no.3 :grinning_squinting_face: