Fill in the gap in each sentence with one suitable word?
a. Have you ever been struck by lightning?
b. The Amazon river basin has the world’s largest tropical rainforest.
c. Scientists are very interested in tidal power. They are thinking of how to use the rise and fall of the tide to produce electricity.
d. The girl fell into the river but a passer-by saved hẹr from drowning.
e. Only the female mosquito can suck blood and transmit malaria.