Invented or was invented ? Use the correct form of the verb in brackets.
Phát minh hay được phát mình? Sử dụng dạng đúng của các từ dưới đây.
a) Hubert Booth __________ a compact and modem vacuum cleaner.
b) Bottle-making machinery __________ by Michael J. Owens.
c) The air conditioner __________ by Willis Carrier in 1902.
d) The crossword puzzle __________ by Arthur Wynne.
e) Clarence Birdseye __________ frozen food.
f) The Computer mouse______________ by Douglas Engelbart.
g) The first credit card________________ by Ralph Schneider.
h) Color photography by Auguste and Louis Lumiere.
i) Igor Sikorsky_______________ the first successful helicopter.
j) The ballpoint pen________________ by Ladislo Biro in 1938.
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Hướng dẫn giải
a. invented
b. was invented
c. was invented
d. was invented
e. invented
f. was invented
g. was invented
h. was invented
i. invented
j. was invented