____ is to be done is ______ to carry it out smoothly since the decision has been made．

We have been looking at houses, but haven’t found ________ we like yet.

It suddenly occurred to me        I hadn’t locked my door．

-----Which of these electronic dictionaries do you like most ? -------________.They’re both expensive and of little use.

I’d appreciate ________ if you could let me know in advance whether or not you will come.