A: I A look at flowers for a long time. The sentence requires a verb that fits the context of observing flowers. Option 1 'must' and 3 'can' do not fit grammatically. Option 2 'look' is the correct verb.
B: When B gave me flowers, it was the best present for me. The sentence describes a past event. Option 1 'somebody' and 2 'nobody' do not fit grammatically. Option 3 'gave' is the correct past tense verb.
C: My mother and grandmother. C like to grow berries, vegetables and fruit, help me to plant the seeds and to water my flowers. The sentence describes a general truth or habit. Option 1 'which' and 2 'what' are interrogative/relative pronouns and do not fit. Option 3 'like' is the correct verb form.
D: Now I D a small flowerbed for roses. The sentence describes a current action. Option 1 'preparing' and 3 'are preparing' are participial forms that need an auxiliary verb or are plural. Option 2 'am' is the correct auxiliary verb for the first person singular 'I'.
E: I hope to have nice roses next summer. In autumn and winter I grow flowers and other decorative plants in flowerpots on the windowsills of fat. The sentence describes a quantity of plants. Option 1 'a few' and 2 'while' do not fit the context of growing plants. Option 3 'little' is the correct adjective to describe a small number of plants in flowerpots.