Grammar exercise 1 of 2 语法练习1
Use 的、了、地 as “Chinese grammar rules: 5 general rules for Chinese grammar” explains it, through 9 items over 7 of its example sentences: fill the gap where the word was taken out, and put the words of each sentence back in order.
Chinese grammar rules: 5 general rules for Chinese grammar
9 items. Each one you miss comes back later in the same sitting.