The painting is .so valuable that it is difficult to calculate____ its price would be.A that B. which C.what D.\
Look out! The ceiling _____ fall down.
. -- Who are those people? -- A group ____ itself peace protection.
It was nearly supper time _____ Bob began to feel terrible in his stomach..
Is this hospital _____ you once worked for nearly 10 years?
The car passed through the streets _____ we thought was a very dangerous speed.