Complete the words with the negative prefixes: semi-, dis-, un-, de-, in-, mis-, over.

1. There are permanent and ______-permanent joints. What has the form of a ______-circule? 2. Overloaded machine component may be ______ -formed. 3. ______-connectable joints are widely used. 4. ______-use of a machine part will result in its breaking. 5. There is nothing ______-usual in mechanics. 6. Machine components will be ______-shaped if they do not resist stresses. 7. What ______- directional quantities do you know? 8.______ -allignment may occur. 9.______ - running clutches may be of a jaw type.