If my frirends have any problems, my door is ______ open to them.

It was because it had been raining for several days, leading to a flood over the fields and the villages that many people fell _______ without foods and shelters

It is reported in Washington Post that an unknown terrorist group has ______ responsibility for this morning’s bomb attack.

Help others whenever you can _______ you will make the world a nicer place to live in

If we are not _______ the progress we have made, we will have greater success.