15. An awful crash between an express train and a bus _____ , however, occur the other day in Russia.A. does B. did D. has to D. had to
The doctor kept telling him that he mustn’t smoke, but ________ didn’t help.
Don’t leave your keys in the car. Someone might steal ________ 。
Computers must be of great use to ________ doing the scientific research.
The cruelty of the Germans towards the Jews and ________ of the Japanese towards their prisoners, filled ________ with horror.
At the shop, they wanted to show me all the dresses, but I was interested only in ________ in the window.