1.they are going to get bigger before getting smaller."before"是介词，介词后面加动词ing形式2.Education there is provided free of charge by the government.3.The city will send waste materials towards the sun to prevent landfill and environmental problems....
1.they are going to get bigger before getting smaller.2.Education there is provided free of charge by the government.3.The city will send waste materials towards the sun to pre...
