____you come to my birthday party tomorrow, Robert–I’m afraid not. I have to study for my exam.

He was so pleased with all _____we had done for him _____he wrote us a letter to praise for it. [ ]

________ is it from your new home to our school —About two kilometres.

______ your teacher the problem with learning, theoretically, and they will help you

We believe scientists will ________a way tosolve the problem of air pollution.