One of the parts of the following sentance an error. Identify that part from the given options. 'Mr. Gupta, our Chairman, accompanied by his secretary have arrived at the office.'

Which of the following sentences is correct?

The doctor ______ special course of antibiotics on the patient to ______ the disease.

Fill in the blank with a suitable word.

There are more things in heaven and earth ________ are dreamt of in our philosophy

The following sentence is divided into three parts. One of the parts has an error. Identify the part which has an error. If there is no error, mark ‘4’.
A) The admission ticket
B) entitling her to
C) win a prize

Pick out the part of sentence which has an error. If there is no error mark ‘4’.
A) It wasn't necessary for her
B) To take time of work
C) when her son was ill

Which of the following sentences is correct?