Form verbs from the given nouns/adjectives.

Solution:

We use the prefix 'en-' or the suffix '-en' to form verbs meaning 'make' from nouns or adjectives.

• 1. One new medicine will ensure (sure) patients' fast recovery.
• 2. STOP AND TAKE A BREAK. DRIVING WHILE TIRED endangers (danger) LIVES!
• 3. Need a pair of trousers to be shortened (short) or a skirt to be lengthened (length)?
• 4. NEW STUDY SHOWS SMOKING weakens (weak) THE HEART.

Answer: ensure, endangers, shortened, lengthened, weakens