It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
—Pity you missed the lecture on nuclear pollution. — I it, but I was busy preparing for a job interview.
—I’m dead tired. I can’t walk any further, Jenny.—____, Tommy. You can do it.
There are two roads leading to the power station along the river.You can take___________ of the roads.
— Is everyone here?— Not yet.Look,there ______________ the rest of our guests!
—Will you take part in the speech contest?—____________ I have long been expecting such an activity.