—This math exercise is ________ difficult ________ I can’t work it out.
—Come on! Use your head and you will find a way.
such; that
so; which
so; that
---Listen! Kate is singing in the classroom. ----It_____be Kate. She has gone to the Library.
The songs of Coco sound________. Her CDs sell_______.
Bob has made a lot of promises, but______of them have been carried out.
Mary did all ______she could to get on well_______her classmates.
She hates people_______don’t help others when they have trouble.