Cars play an important role in modem life, but they also cause many problems like air pollution.

We didn’t find the Blacks___________the lecture —No one had told them about___________a lecture the following day

My brother ____ from Monday to Friday.

But for your timely warning, we _____ into great trouble.— Well, you know we’re friends.

the yard, I found it _____ with lots of _____ leaves.