Grammar exercise 1 of 3 语法练习1
Use 关于、对于、关、对、于 as “How to use 关于 (guānyú) and 对于 (duìyú) correctly in Chinese” explains it, through 8 items over 6 of its example sentences: fill the gap where the word was taken out, and put the words of each sentence back in order.
How to use 关于 (guānyú) and 对于 (duìyú) correctly in Chinese
8 items. Each one you miss comes back later in the same sitting.