Yu Bao was born _____ Nanjing _____ August 16th, 1990.[ ]

He knew the problem was serious and promised to look into it _____ he reached office.

I called you yesterday evening, but there was no answer.–Oh, I am sorry. I __________ dinner in my friend’s home.

You had better _______ wine because you have to drive back home.

His sister wants to find a job_____ a language teacher.[ ]