What do you have __________ lunch?[ ]

Did you have a good time that day?－Yes, but the temperature was a little _______ and we didn’t wear warm clothes, so we went home early.

We have friends to help us fight against pollution, and trees are one of ________.

We had just covered a distance of three miles the engine and the car came to a stop

I cannot______ puzzled，for I simply cannot understand how I could have made such a stupid mistake.