speculation and deduction

Tammekänd, L. 2009. National Exam in English
Exercise 3
Speculation and Deduction; Certainty, Probability, Possibility

Speculation and Deduction; Certainty, Probability, Possibility

Gap-fill exercise

Complete the sentences using must, can’t, may, might, could. Several variants are possible. Pay attention to the contractions. Fill in all the gaps, then press "Check" to check your answers.
1. I'm certain he doesn't know the secret.
He the secret.
2. Perhaps he will be home soon.
He home soon.
3. I'm sure she has gone on holiday.
She on holiday.
4. It's possible she has been delayed in traffic.
She in traffic.
5. I'm certain she is looking for a new job.
She for a new job.
6. Perhaps she is visiting a friend.
She a friend.
7. I'm certain he didn‘t call me.
He me.
8. I'm certain Marie sent you a birthday card.
Marie you a birthday card.
9. I’m sure David didn't go to the supermarket.
David to the supermarket.
10. It's likely she has forgotten about the meeting.
She about the meeting.
11. It's likely we will go shopping this afternoon.
We shopping this afternoon.
12. It's likely he hasn't been promoted.
He .