1．Only when theories are __________ (combination) with practice can we know how they work.
[答案] combined
2．The organization is run on a __________ (volunteer) basis.
[答案] voluntary
3．The young actress looked so __________ (charm) in her beautiful dress that we took masses of pictures with her.
[答案] charming
4．They decorated the house __________ (regard) of the cost.
[答案] regardless
5．Jack was quite __________ (ambition) and finally he achieved his dream.
[答案] ambitious
