1. Is (a/the/-) English easy?2. The plane is flying (at/in/on) the

1. Is (a/the/-) English easy?
2. The plane is flying (at/in/on) the blue sky.
3. This is serious and we must (act/action) immediately.
4. I was really (amazing/amazed) when I was offered a new job.
5. Water (boils/is boiling) at 100 degrees.
6. I (go/will go) and see Venice as I (reach/will reach) Italy.
7. When (did you see/have you seen) Jack?-Oh, I
(didn't meet/haven't met) him for ages.
8. These (gentleman/gentlemen) had problems with their
(tooth/tooths/teeth)
9. She was afraid he (will feel/would feel) depressed.