If the sustainable development of small economies is speeded up, their effectiveness will be ultimately put into the global economy.

They have （） production. A: brought up B: put up C: speeded up D: pulled up

International cooperation speeded up China's economic development while contributing a lot to the world economy.

The car ______ as it approached the parking lot. A: speeded up B: slowed down C: broke down D: caught up with

When borrowers started to have trouble paying mortgages back, the ocean of finacing _____. A: dried up B: picked up C: speeded up D: locked up