You can depend on it that I’m trying to do what is best, but _____ I have got to consider the cost [ ]

When asked why he went there, he said he was sent there _____for a space flight. [ ]

Stop throwing litter around, or you’ll offendthe neighbors.

I paid a fine of 200yuan for speeding. If only I_________ the traffic rules!

The dictionary still _________ where I_________ it moment ago.