21.4.1 exercise: Formation of adverbs based on adjectives
Many adverbs are build on the basis of the feminine form of the adjective by adding the ending -mente. If there is no feminine form, because the adjective ends on a consonante or e, the ending -mente is added to this neutral form.
Some adjectives, for instance baixo, alto, barato, rápido doesn't have an own form for the adverb. In this case there is no difference between the adverb and the adjective. (Adverbs like that exists in English as well: He runs fast. <=> A fast car.)
With other adjectives, for instance mau => mal, bom => bem the adverb has a completely different form.
In the following sentences the adjective is given and in the following sentences the corresponding adverb is used. Choose the right adverb.