Different things
Articles
100
What preposition (przyimek) do we use before the names of the days of the week?

on (on Monday, on Saturday night)

100

Is it true that we can insert "a" article (przedimek) before the plural nouns (rzeczowniki w liczbie mnogiej)? 

No, we can insert "a" article only before the singular nouns. (rzeczowniki w liczbie pojedynczej)

200

What is the missing word? Why don't you come ... after work?

around / round

200

When do we use "an" article? 

Before the singular nouns (rzeczowniki w liczbie pojedynczej) that begin with a vowel sound (samogłoska). 

300

Translate the word in brackets to complete the sentence: She doesn't (obwinia) ... anyone for her father's death. 

blame

300

Is this sentence correct? The Vistula is the longest river in Poland. 

Yes, it is. We can use "the" article both before the names of rivers and the superlative adjectives (przymiotniki w stopniu najwyższym). 

400

Before which parts of speech (części mowy) do we use the preposition (przyimek) during?

a) adjectives (przymiotniki) b) nouns (rzeczowniki) c) verbs (czasowniki)

nouns (during a meeting, during sleep) 

400

Complete the sentence using the correct articles: I like ... blue T-shirt over there better than ... red one.

the, the

500

Translate the sentence: Mogę prosić o menu?

May I have the menu? / Could I see the menu?

500

Complete the sentence using the correct articles: After ... long day, ... cup of tea tastes particularly good. (general statement) 

a, a