Verbals – Pre-Intermediate 2.
Complete the text with the correct forms of the verbs (-ing form, Infinitive or Past Participle)
Properly canned food can be saved for as long as three years. If not properly (13) (seal) the food can be spoiled by the growth of organisms. In severe cases, bacteria can cause a fatal form of (14) (poison) called ’botulism’. For this reason, it is very important (15) . (check) the seal of the jar or bottle regularly (16) (make) sure it has remained undisturbed.