Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word(s) for each of the following blanks.
                                                What is a coincidence?

A coincidence is a surprising thing that happens to us. For example, you and a friend both go shopping on the same day. You don’t go together and don’t discuss your shopping plans in (21) ______, but when you meet up afterwards, you are amazed to discover that you’ve bought an identical T-shirt.

By (22) , you each decided to buy the same one. Many people (23) coincidences as significant. Did you and your friend communicate with each other in some subconscious way? What does it tell you about your friendship? Well, the simple (24) ________ could be that, being (25) friends, you have similar taste in clothes.

In reality, life is (26) ________of coincidences, but normally we don’t notice them. For example, in almost fifty percent of all football matches, two players share the same birthday. This seems surprising, (27) ________ that there are 365 possible birthdays in the year. But most of these matches will be played without anybody being (28) _______ that coincidence exists. (29)________your birthday is today, you don’t generally tell people about it. In addition, without realising it, you probably (30) ______ into contact with lots of people who were born on the same day as you. But when a coincidence brought to your attention, it still seems amazing.

Điền vào ô 21