_____ has recently been done to provide more buses for the people, a shortage of public vehiclesremains a serious problem[ ]

－Did you tell Julia about the result?－Oh, no, I forgot. I ________ her now.

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

Good friends as we are, I still find her difficult to understand ________.[ ]

While writing a letter, _____. [ ]