Complete the following sentence using the correct option:
Grandfather has been sitting ______ the waiting room of the eye clinic ______ forty minutes.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → in ... for
Complete sentence: Grandfather has been sitting in the waiting room of the eye clinic for forty minutes. Grandfather is inside the waiting room, and “forty minutes” is a length of time.
| Option | Used to show | Example |
|---|---|---|
| (1) in ... since | The first blank is right. “Since” shows the point in time when something began, such as a day or a clock time. | It has been raining since Monday. |
| (2) on ... for | The second blank is right, but the first is wrong. “On” shows something resting on a surface. | The cat is sleeping on the sofa. |
| (3) in ... for (answer) | in: a place inside a closed space, like a room; for: how long something has gone on | Riya has been practising in the music room for two hours. |
| (4) over ... during | The first blank is wrong. “Over” shows a position above something. | A kite flew over our house. |