Parents complain their children are behaving unreasonably _____children consider their parents to be old-fashioned.
A big dust storm covered Sydney for hours, ______ the Sydney Opera House invisible.
---Hi, Terry, can I use your computer for a while this afternoon? ---Sorry.______.
---How can I apply for an online course? ---Just fill out this form and we______ what we can do for you.
---Where were you when I called at your house this morning? ---Oh, I_____ for a friend from Tokyo at the airport.
Plastic bags are provided for our convenience but they have also_______ the pollution of the environment.