Hi CRP, 1.It is hard to revitalise the economy in [the] countryside as the shortage of labour has become a problem in rural areas. (We use the definite article with nouns referring to some places (e.g. the countryside, look at the moon, the shopping centre, the subway) 2. The poor prospects of employment and sluggish of local economies lead to the population shift to cities. (You have two factors driving the migration of people to cities. One of these is the sluggish local economies. You can simply remove the preposition "of", leaving two adjectives "sluggish" and "local" to describe the noun "economies". We write the adjective for general opinions (sluggish), followed by the adjective for specific opinions (local) Reference URL: https://learnenglish.britishcouncil.org/english-grammar/adjective-order (Refer to the subtitle "Three or more adjectives". As you are referring to a social phenomenon (population shift to cities) for the first time, "a" is used. You can also use "migration" instead of "population shift". "The poor prospects of employment and sluggish local economies lead to [a] population shift / migration to cities." Some other alternatives to "sluggish" are "weak" and "lacklustre". Reference URL: http://lexicon.ft.com/Term?term=lacklustre

These are pretty close to correct as-is, but I will offer a few corrections and suggestions: 1.It is hard to revitalise the economy in countryside as the shortage of labour has become a problem in rural areas. 1.It is hard to revitalise the economy in the countryside as the shortage of labour has become a problem in rural areas. 2.The poor prospects of employment and sluggish of local economies lead to the population shift to cities. If this is supposed to be present-tense, then: "The poor prospects of employment and sluggishness of local economies leads to a population shift toward cities." If past-tense: "The poor prospects of employment and sluggishness of local economies led to a population shift toward cities." Sluggishness* is a fine word to use in this case, but "stagnant" would be a good alternative.

Please refer to the post above.