Which one of the following sentences would be a good topic sentence (first sentence) for the paragraph below? They’re inexpensive and work great. There’s nothing worse than soggy lettuce. Use this gadget, and you'll never have any more problems with soggy lettuce. No more embarrassing dinner parties - spoilt by that soggy lettuce! Incidentally, don't forget to use some red leaf lettuce for a change.

Each paragraph is a self contained unit: the first sentence is the 'topic sentence'; the last sentence is the 'link sentence' and the remaining sentences develop the subject within each paragraph.

The 'topic sentence' introduces us to the subject of the paragraph and the 'link sentence' is a sentence that introduces the next paragraph: this ensures a smooth continuity in the text.