Tham khảo tài liệu 'test on gerund and infinitive ( 2)', tài liệu phổ thông, ôn thi đh-cđ phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TEST ON GERUND AND INFINITIVE 2 Exercise 1. Cho dạng đúng của động từ trong ngoặc Doing or To do AMATEUR ASTRONOMY. Would you like 1 - to know knowing more about the stars but don t know where 2 -to begin beginning . Well eventhough there appear 3 - to be being millions of stars only about six thousand are visible. The visible stars are the brightest but not necessarily the closest. Many of these seem 4 - to group grouping together. These groupings are called constellations and many have unusual names such as Tauru the Bull the Hunter. You can learn 5 -to recognize recognizing many of the constellations by 6 - remember remembering what they represent. The best time for you 7 - to study studying the stars is during cold clear night. It s easier 8 - to see seeing many of the fainter stars then because the atmosphere lets more light 9 - reach to reach the earth. Don t be discouraged by 10 - not to have not having a telescope. You can always see important stars - like Polaris the North Star. Early navigators knew how 11 - to tell telling direction by 12 - find finding Polaris because it is almost directly over the North Pole. In order 13 - keeping to keep a steady direction east or west you have 14 - to make making sure Polaris is in the same position each night. Explorers have used this method of 15 - navigate navigating for over three thousand years. If you re interested in 16 - learn learning more consider 17 - to enroll enrolling in a course or 18 - to join joining a local group of astronomers. And of course before 19 - to invest investing in a telescope or any expensive equipment ask your local science museum or school department for advice. BIRD - WATCHING There are some things you can do anywhere - like 1 -to observe observing birds. Bird - watching is a pastime even a competitive sport for millions of people around the world. To bird lovers it s thrilling 2 - to see seeing a rare bird in the wild but it s equally exciting 3 - to observe observing birds close to
