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Exercise "Expressing Uncertainty : may-might-must...", created by here4u (a free exercise to learn English):
Results of the 20 834 people who have taken this test:
Average mark: 53.5 / 100 Share
Latest member with a 100/100 (perfect mark): colocolo / FRANCE, on Monday 20 February - 11:35:
"Thanks again...!"
They got a perfect mark
Stats (20831 candidates)
Question 1 passed: 61.5 %
1) There can't be * so many people waiting for the lecture about Quantum Physics...
Question 2 passed: 60 %
Therefore, there must be * another meeting on the same floor.
Question 3 passed: 69.3 %
You should have put * clearer directions in the lobby,
Question 4 passed: 52.2 %
because some people might make * a mistake and be late, finally.
Question 5 passed: 59.1 %
As Mr Pierce is so late, he may have made * a mistake and gone to the wrong conference room.
Question 6 passed: 65.6 %
) Exercising at a reasonable rhythm * (impossibility in the present) bad for you. If you jog 2 laps at a medium speed,
Question 7 passed: 52 %
it * (potential) your resistance and your breathing capacity,
Question 8 passed: 57.2 %
but it * (possibility in the present) too much for your muscles, so early after your operation,
Question 9 passed: 42.4 %
and it * ('very strong possibility')your recovery .
Question 10 passed: 39.2 %
He * (impossibility in the past) the javelin so far ...
Question 11 passed: 51.4 %
If so, it * (simple possibility in the past) his muscles.
Question 12 passed: 54 %
You * (advice-suggestion) him to take it easy.
Question 13 passed: 41.8 %
If you don't, it *(potential.) him believe that he's doing correctly now,
Question 14 passed: 49.5 %
he * (possibility in the present) on exercising unreasonably
Question 15 passed: 46 %
and he * (very strong and uncertain possibility) it in a few weeks.
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