(1) Lasers
(2) Radio waves
(3) Infrared waves
(4) Ultrasonic waves
February 4, 2021
sinxoo
(A) Lens
(B) Film
(C) Aperture
(D) Shutter
February 4, 2021
(A) Brucine
(B) Caffeine
(C) Phenylalanine
(D) Theine
February 4, 2021
(A) had read
(B) read
(C) red
(D) read
February 3, 2021
(A) get up
(B) got up
(C) had to get up
(D) had got up
February 3, 2021
(A) Who do
(B) Who does
(C) Whom do
(D) Whom does
February 3, 2021
(A) has to walk
(B) has to walk
(C) had to walk
(D) had to walked
February 3, 2021
(A) should pass
(B) should have passed
(C) has to pass
(D) have to pass
February 3, 2021
(A) During
(B) Until
(C) Unless
(D) Between
February 3, 2021
(A) was
(B) were
(C) had
(D) have had
February 3, 2021