They had a party _____ the evening of October l. [ ]

So little ________ about science that the lecture was my understanding.

Did you read a book about customs last week?– Yes, I found ______ very useful to know the customs of foreign countries.

Have you seen my book?I remember I put it ___________,but I can’t find it now.

________ the boss has arrived, let’s begin our discussion right away.