Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.
Though having lived abroad for years, many Chinese still ______ the traditional customs.
The top leaders of the two countries are holding talks in a friendly
The young man made a ______ to his parents that he would try to earn his own living after graduation.
I bought a dress for you only 10 dollars in a sale; it was a real _____.