Mrs Black isn’t in and I’ll have to ring ______ I would appreciate it if you ring _____ after 6 o’clock?

What some people don’t realize is ________ difficult life can be after they get addicted to drugs.

How long do you think it ishe arrived here?— Only half a year I believe.[ ]

S Day, the minister of Health Departmentdemanded that the problems _____ paid special attention to

The sentence doesn’t make any ,no matter how you read it.