We should do everything we can _______ the birds _______ danger.
I'm sure that stricter roles ______ to control cigarette smoking very soon.
---I’ve got the final Harry Potter book. ---You will love it. I it twice .
Although you may meet some difficulties, you should never _____.
Stop ______ about the traffic. Just think about what we can do to improve it.
I can't connect my computer to the Interrnet. There must be ______ wrong with it.