__________ hat is it? Sorry, I don’t know.

Do you think it is _____ to write an English essay?—Yes, you can do it ______ if you practice more.

Look at the picture on the wall. It ________be David’s.—Yes, his name is on the first page.

______ are you buying so much food?—Because your uncle is coming for supper.

My grandmother a lot of changes in Tianjin since she came here.