There is _____with  your  computer.

—Have you found your lost camera? —No, I haven’t found _____, but I bought _____ this morning． 

Ms Wang is an excellent teacher.           in our class loves her．

 — Susan, go and join your sister cleaning the yard.— Why ___? John is sitting there doing nothing.

The cost of buying a house in Beijing is higher than ______in Luoyang。