In FCE Use of English Part 2 you have to fill gaps with one word. This word is often an auxiliary verb or modal verb.

FCE USE OF ENGLISH PART 2 PREPARATION

AUXILIARY and MODAL VERB EXERCISE

by Bob Wilson at autoenglish.org

HOME FCE READING FCE USE Part 1 FCE USE Part 2 FCE USE Part 3 FCE USE Part 4 MODAL VERBS OFFICIAL SITE
TO PRACTISE MODAL VERBS IN MORE DETAIL GO HERE: http://www.autoenglish.org/modalverbs.htm
FCE Auxiliary & Modal Verb Exercise
Fill the gaps.