A. The children are reading books in the library (图书馆).
B. Miss Wang teaches us Maths.
C. The little girl studies very hard.
D. They walked to school five years ago.
E. She likes dancing.
所有昆虫的幼虫都要经过五次蜕皮．（判断对错）
-- Tu Youyou received the Nobel Prize for her ________ of anemisinin（青蒿素）.
-- And she was the first Chinese who won the prize in science.
clean的过去式是____.
