Directions: Read the sentence to find whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is (5). Ignore the errors of punctuation if any. If the bystander had not been (1)/ familiar with first-aid techniques, (2)/ the driver which had met (3)/ with the accident would have died. (4)/ No error (5)