用doubtful of造句子，“doubtful of”造句

And if you do take one, you'll probably make the shop assistants feel unease, they might be doubtful of your intentions.

I don't think we were ever doubtful of the success of this event today, a government spokesman told reporters.

I was doubtful of the merits of such restrictions, but then this may have been the only way to cut off the power demand for money.