—Do you know who the pen ___? –Sorry,I don’t know.
The doctor has devoted most of his time to ___________ the patients.
As a student, I can’t afford ___________ a new mobile phone.
If we don’t study hard, we will___________ in our class.
— Did you enjoy the outdoor training yesterday? — No, not at all! I was _____dead after so much hard training.
They thought ________ important to look left and right when ________ the road.