_____been shown

There are on the table.

In Copenhagen Climate Conference，rich countries promised to________a fund of $ 100 billion a year by 2020 to help developing countries.[ ]

135. Whoever spits in public in Beijingwill be fined up to 50 yuan in _______ effort to improve citizens’ behaviorahead of ______ Olympics.

Linda made great progress inher English last term. — ____________.