Unit 10 : life on other planets

Thanh Quỳnh

Question 37. The first of four orbital test flights occurred in 1981, leading to operational flights beginning
in 1982.

=> Before ___________________________________________________.

Question 38. By the end of this week, my father will have bought a new vacuum cleaner as a gift for my
mother.

=> By the end of this week, a new vacuum cleaner ________________________.

Question 39. Air-conditioners weren’t used populary in the past. They are now installed in almost every
households.

=> Air-conditioners_________________________________________________.

Question 40. In the past, students only learned what teachers provided them. Nowadays, students are
expected to self-study a lot.

=> Students_______________________________________________________.

Nguyễn Huyền Trâm
18 tháng 6 2020 lúc 22:33

Question 37. The first of four orbital test flights occurred in 1981, leading to operational flights beginning
in 1982.

=> Before 1982, the first of four orbital test flights occurred in 1981_

Question 38. By the end of this week, my father will have bought a new vacuum cleaner as a gift for my
mother.

=> By the end of this week, a new vacuum cleaner __will have been bought as a gift for my mother by my father___.

Question 39. Air-conditioners weren’t used populary in the past. They are now installed in almost every
households.

=> Air-conditioners____which are now installed in almost every
households weren’t used populary in the past

Question 40. In the past, students only learned what teachers provided them. Nowadays, students are
expected to self-study a lot.

=> Students_in nowadays study much than students in the past

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