A.for danger | B.danger | C.to danger | D.in danger |
A.Why we should plant more trees? |
B.What should we do to help the Earth? |
C.What should we do to protect the air? |
D.When should we protect the Earth? |
A.with | B.of | C.from | D.on |
A.green | B.white | C.brown | D.blue |
A.The sun looks beautiful from space. |
B.The earth looks beautiful from space. |
C.The star looks beautiful from space. |
D.The moon looks beautiful from space. |