(2012·四川)—Goodbye，John.Come back again sometime.—Sure，________.

With a lot of difficulties _______, they went to the seashore and had a good rest.

The light in the room was _____, but nobody was in.

It is fashionable to drive a car, but to drive a car is not nearly as difficult as it is imagined on condition that you ________ the specialized rules.

― It is reported that Americans eat too much protein each day. ―They eat ______as they actually need.