1. Word building.
Look at these sentences:
The announcement follows the recent discovery of water.
…a reference to the shape of the 10 towers they plan to build.
To make the nouns announcement, discovery and reference, the suffixes -ment, -ence and -y have been added to the verbs announce, discover and refer.
Add -ment, -ence or -y to the verbs below to make nouns. Make any spelling changes necessary.