giải thích giúp em tại sao lại chọn đáp án in đậm đó vậy ạ
In 1875 Webb swam the Channel twice. Both times he did not use any special (1) ____ . The first time he failed because the (2) ____ and the waves were too strong, so he gave up and came back to the beach.
The second time he tried, three fishing boats went with him, and he covered himself in oil to help him stay warm in the water. Some jellyfish stung him (3) _____ he was swimming, but he didn’t stop. His second attempt was successful. His (4) took 21 hours and 45 minutes.
1. A. glove B. equipment C. boot
2. A. beac B. water C. wind
3. A. when B. while C. then
4. A. swim B. swimming C. swam