Grammar exercise 2 of 2 语法练习2
Use 碰、见、上 as “How to use 碰 (pèng), 碰见 (pèngjiàn) and 碰上 (pèngshàng) in Chinese grammar” explains it, through 5 items over 5 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 碰 (pèng), 碰见 (pèngjiàn) and 碰上 (pèngshàng) in Chinese grammar
5 items. Each one you miss comes back later in the same sitting.