So _____ that modern industry cannot develop without it.
| A．electricity is important | B．important is electricity |
| C．electricity important is | D．important electricity is |
The old town has narrow streets and small houses _____are built close to each other.
| A．they | B．where | C．what | D．that |
When I got on the bus,I_____I had left my wallet at home.
| A．was realizing | B．realized | C．have realized | D．would realize |
I'm sorry I didn't phone you, but I've been very busythe past couple of weeks.
| A． | beyond | B． | with | C． | among | D． | over |
Are you going to Tom’s birthday party?
-_____.I might have to work.
| A．It depends | B．Thank you | C．Sound great | D．Don’t mention it |
He had his camera ready________he saw something that he would make a good picture.
A even if B if only C in case D so that