Ⅰ.单句语法填空
1．I still don't know what caused the computer to crash (crash).
2．The professor referred to his experiences (experience)abroad when he gave us a talk.
3．Struck/Stricken (strike) by the mudslide，the town was cut off from the outside.
4．Some people tried many ways to lose weight，ending up gaining (gain) weight soon again.
5．They found the remains of buildings buried (bury) under the sand，together with a lot of treasure.
6．An idea occurred to me that I should turn to my former teacher for help.
7．She picked up Spanish while she was living in Mexico.
8．She must have left the handbag where she often has a date with her boyfriend.
9．After the earthquake I saw the whole town in ruins，but now everything has changed.
10．The government has issued a warning that the fish may not be fit to eat.
