Try to use verbs like "should", "might", "could" whenever possible.
Exercise created by Lilliam Hurst, using Hot Potatoes by Martin Holmes
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue (but note that I did NOT prepare any clues this time. . . ). You will lose points if you ask for hints or clues!