Tens of thousands of Koreans took
(to) the street
s Monday to protest
(against)
the government's decision to resume importing US beef, which had been
suspended for five years due to mad cow disease. The government is
[being pressured into reimpos
ing* / under pressure to reimpose] the ban, but it hasn't made any decision.
Meantime*, Washington convinced the
Korean President that the beef will be monitored to ensure it's not
contaminated.
*After a preposition (into), the only available verb form is the gerund.
* In the meantime or Meanwhile