骑公共自行车出行已成为许多南昌市民的习惯,但这项便民、低碳的政策却遭遇了不小的尴尬:一千余辆公共自行车丢失。要避免这一尴尬必须( )
I don’t know if ______ to the party.I will let you know if ______.
—Whose workbook is this, Tony? —Look! Ann's name is on it! It ______ be hers.
—______ will you come back from Shanghai?—In one month.
—I went to Daming Lake yesterday.There were ______ people. —Yes.Everyone wants to go out on such a good day.
More and more people find ______ necessary to protect our earth.