Ⅰ.单句语法填空
1.Thereason________shechangedhermindisquiteclear.
2.Thedays________theytravelledtogethermeantalottohim.
3.Isawahouse, thewindowsof________werebroken.
4.Shehastwosons, bothof________graduatedfromHarvardUniversity.
5.Nobodyknowsthereasonfor________shedidn'tattendthemeeting.
6.Wewentthroughaperiod________communicationswereverydifficultintheruralareas.
7.Thechildren, allof________hadplayedthewholedaylong, werewornout.
8.Wevisitedthecarfactory________myuncleonceworkedthreeyearsago.
9.Thisisthefactory________Ivisitedlastyear.
10.Theoldmanhastwosons, andbothof________arelawyers.