We are so disappointed that he always turns a deaf ear to our warnings ________ we remind him not to drive after getting drunk.

As a scientist, Madam Curie devoted herself ________ to her research and that was why she was given two Nobel Prizes

in the lab, ________ was taken charge of by Professor Curie, _______ theydid the experiment

I don’t believe you can do today’s job withyesterday’s methods and be in business tomorrow，

He says “_______” to his parents before he goes to bed.