Do you smoke? — No, I don’tIt is two years since I ______[ ]

There used to ________ a clean river inthe village, but now it’s dirty.

I’m a good student, I’m ______ school.

Those who suffer from the headache will find they get ________ from this medicine.

It is already 10 o’clock. I wonder how it ______ thatshe was two hours later on such a short trip.