Valitse lauseeseen sopiva muoto.

1. Stephanie Kwolik's name might not ring a bell, but she's responsible for saving thousands of lives. In 1965, she invented Kevlar, the material which a. are used b. is using c. is used d. have been used in bulletproof vests.
a b c d

2. The "black box" on an airplane is actually bright orange so that it can a. be easily found b. have easily been found c. easily find d. have easily found among the wreckage if the plane crashes.
a b c d

3. Chimpanzees are excellent tool makers and a. has been documented b. are being documented c. have documented d. have been documented to make very primitive spears to kill galagos (bushbabies, little night monkeys) hiding in the trees at night.
a b c d

4. Television lost about 20 percent of its advertising revenue immediately after tobacco ads a. banned b. were banned c. are banned d. was banned in 1971.
a b c d

5. I a. was told b. have told c. were told d. had told that the Wright Brothers’ first successful flight on December 17, 1903 covered a distance of about 120 feet (36.6m) —shorter than the wingspan of a modern 747. Wow!
a b c d

6. Cruise control and automatic transmissions a. was invented b. have invented c. were invented d. are being invented by a blind engineer named Ralph Teetor.
a b c d

7. The hood ornament of a Rolls Royce a. are named b. have been named c. are being named d. is named "The Spirit of Ecstasy."
a b c d

8. David Bowie's left eye is famous for a. being damaged b. being damaging c. been damaged d. having damaged after a fight as a child. It is permanently dilated.
a b c d

9. a. They have been said b. It says c. They say d. They are said the longest jellyfish on record measured 160 feet (49 m), more than half the length of a football field.
a b c d

10. The area where Washington, D.C., now stands was originally a mosquito-infested swamp. It had a. to drain b. to be drained c. been draining d. to have been draining for years before the American government was moved to the city in 1800.
a b c d

10p