31. The engine of the bus was out of order and the bad weather ______ the worries of the passengers.
18.Seldom ____ him recently, for you see I’m preparing for the project.
17.I wonder what’s your attitude ____ the problem ____ yesterday.
16.The shopping center in the city was ____ as a result of a cigarette, which shocked the whole country.
15.—Will you go to the party tomorrow, Xiao Hai? —No, ____ I was invited to.
14.It was in the village ____ he once lived ____ he got his junior education.