I cannot______ puzzled, for I simply cannot understand how I could have made such a stupid mistake.
---What do you think of the two students ______ to take part in the competition? ---They are hardworking as well as intelligent.
You should _____ the advantages and disadvantages before making a decision.
The reason _____ he was late for school was _____ he had to send his mother to a hospital.
How strange _____ is that the students are so quiet in the classroom!
He has promised that he will give the prize to _______ finishes the work first.