________ it is expected that students come to college with the ability to solve most problems in their study by themselves , this is not always the case.
In the past 30 years China ______ great advances in the socialist revolution and socialist construction.
I ______ go to bed until I ______ finished my work.
Mary is very late, she ______.
Most of the artists _______ to the party were from South Africa.
“What did you do in the garden?” “I watched my father ______ his motorbike.”