mọi người giúp mình bt nghe trong sách northstar 3 unit 3 với ạ 1. A six-ton piece of space debris the size of a bus fell to Earth in….. A. 2001 B. 2010 C. 2011 2. Two events created………of the debris in space. A. One half (1/2) B. One quarter (1/4) C. One third (1/3) 3. NASA tracks…….large debris fragments that orbit Earth. A. 2,100 B. 21,000 C. 210,000 4. There may be………of tiny debris particles. A. Hundreds B. Millions C. Hundreds of millions 5. Each day, an average of…..of space debris falls to Earth. A. One piece B. Five pieces C. Ten pieces 6. Space debris travels at……kilometers per second. A. 8 B. 8.8 C. 18 7. There are over…….working satellites in orbit around Earth. A. 1,000 B. 5,000 C. 10,000 8. ………..countries formed an organization to solve the problem of space debris. A. Two B. Twelve C. Twenty