Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.

They are some pens,some books somecards.

It is reported that Beijing and Zhangjiakou（张家口）will compete to host the 2022 Winter Olympics, which will _____ China’s social development.

t school,English is compulsory for all students, but French and Russian are___

I’m sorry it’s my power to make a final decision on the project