Grammar exercise 1 of 2 语法练习1
Use 帮、忙 as “How to use 帮 (bāng) and 帮忙 (bāngmáng) correctly in Mandarin Chinese” explains it, through 14 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 帮 (bāng) and 帮忙 (bāngmáng) correctly in Mandarin Chinese
14 items. Each one you miss comes back later in the same sitting.