Thank you for the trouble you have ____ to help me. 

Because of the Mid-autumn Day happening to _________, we have just enjoyed a longer          National Day vacation than ever before, but it is estimated that it will be 38 years __________       we can experience such a coincidence again.

 Are the parents who let their child who is ______ walk in the dark alone at night considerate?

 It is the first time in a year and a half that I _______ the night face to face.

Not until the car looked almost new____ cleaning it.1网