—Is your mother a doctor, Peter?
—Yes, she ________ in Chaoyang Hospital for nearly 20 years.
A.worked B.is working C.has worked D.will work
My sister ________ to music when the telephone rang last night.
A.listens B.will listen C.is listening D.was listening
I ________ at home yesterday afternoon because of the heavy rain.
A.stay B.stayed C.will stay D.have stayed
David's grandfather ________ his dog after supper every day.
A.walks B.walked C.will walk D.has walked
If you keep trying, you ________ great progress.
A.make B.made C.will make D.have made
Our community is becoming ________ than before.
A.beautiful B.more beautiful C.most beautiful D.the most beautiful