Grammar exercise 2 of 3 语法练习2
Use 久、长 as “How to use 长 (cháng) and 久 (jiǔ) correctly in Chinese grammar” explains it, through 12 items over 8 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 长 (cháng) and 久 (jiǔ) correctly in Chinese grammar
12 items. Each one you miss comes back later in the same sitting.