Solution:
In the first blank, article "a" will be used because speaker is making a general statement about a picture. In the second blank, the speaker is specifically pointing out a specific wall, hence, article "the" will be used.

Solution:
Here, the noun after the blank is common noun. Hence, indefinite article will be followed. 'An' is used because the word 'honest' sounds 'onest'.

Solution:
The definite article 'the' is used before specific things/places. The sentence is referring to the specific week after the next.

Solution:
As the speaker talks about a particular day's weather, the blank shall take the definite article 'the'.

Solution:
In the given sentence, 'nice morning' and 'walk' both begins with consonant sound when pronounced and both are unspecific. Therefore, 'a' is the suitable article to fill in both the blanks.

Solution:
'Large' is a common word not beginning with a vowel sound. Hence, article 'a' will be used here.

Solution:
Article "the" will be used because article 'the' is used with something unique (The Sun, The Moon, and The Earth).