China ________ a lot to protect pandas since 1980.
A.does B.did C.has done D.is doing
Dr. Zhong Nanshan still works hard ________ he is 84 years old.
A.though B.if C.so D.because
________ energy, many factories make products with recycled materials.
A.Save B.To Save C.Saving D.Saved
Lao She ________ "people's artist" because he always told stories of common people's lives.
A.calls B.will call C.is called D.will be called
EL Capitan, about 3,000 feet high, is one of the world’s ________ mountains to climb.
A.hard B.harder C.hardest D.the hardest
My dad ________ at least 10,000 steps every day.
A.walks B.is walking C.will walk D.has walked
