--Did you enjoy meeting your old schoolmates at the party last week?--Yes, I did. We ____ each other since we graduated from college.
The science of medicine, _______ progress has been very rapid lately, is perhaps the most important of all the sciences.
—Which day do you think is all right to our next meeting? —You make _______,_______ day is all the same to me.
—Jack, what do you think of the new work? —It's not bad. But the hours are too long. —Oh, _______
_______ the meeting room,he found all the parents already _______ there.
I _______ to help you but I was not able to spare any time.I _______ a paper last night and I'll have to finish it today.