Singular vs. Plural Nouns

I'm not totally certain for the facts but from what I have heard, it seems that there were several people injured.

Come on in and please make yourself comfortable and please don't stand there, take a place.

It's a sure sign that she's contented because she goes around the house chanting songs from the musicals.

Come on we can't wait much longer. Just make your mind up and please make a choose.

You can see that the place is immaculate because there's not a sign of dust anywhere as she makes the cleaning every day.

There were several clients sitting in the surgery waiting to see the doctor.

I'm very keen to cut down on the cost of electricity in this house and so please close off all the lights before you go to bed.

I've been walking for ages in the pouring rain and as a consequence my clothes is wet through.

Now remember when you're travelling on the underground train, don't stand too closely to the doors.

We've got an open fire in our house and the great thing is to go looking for woods to put on the fire.