In each of the following questions, sentences are given with blanks to be filled in with an appropriate word (s). Four alternatives are suggested for each question. Choose the correct alternative out of the four and indicate your choice for the correct answer.

Q:

Every year millions of tourists ______ the Anna Centenary Library in Chennai.

• 1
  is visiting
• 2
  are visiting
• 3
  has visited
• 4
  visit