填空题 Directions: Using the information in the text, complete each sentence 6-10, with a word or phrase from the list below. For each sentence(6-10), mark one letter(A-G)on your Answer Sheet. Do not mark any letter twice. A. providing warning message B. shareware programs are illegally produced C. the Internet helps to increase the use of shareware D. shareware avoids costs of commercial distribution E. there were not many cheap quality commercial software F. you can test shareware before you decide whether to buy it G providing needed service, upgraded version of software and necessary documents

填空题 The essential difference between shareware and ordinary commercial software is that 1.

填空题 Shareware was very popular in 1980's because 1.

填空题 Shareware is usually cheaper than commercial software because 1.

填空题 Measures taken to encourage users pay for the software include 1.

填空题 In the author's opinion, the future of shareware is hopeful because 1.