请高手回答以下题,
7.Igotaletterfrommysister,methatshewouldvisitusnextmonth.
A.tellsB.toldC.tellingD.totell
()8.Theproblemiswedon'thaveenoughtime.
A.itB.whatC.thatD.whether
()9.Ourconcertturnedouttobeagreatsuccess,theyhadneverexpected.
A.whatB.thatC.whenD.which
()10.Althoughitisraining,continueworkinginthefields.
A.sotheyB.andtheyC.buttheyD.they
()11.ApipelinewillbebuilttosomeeasternprovinceswithnaturalgasfromthewestofChina.
A.sendB.supplyC.sellD.offer