Would you please ______ the paper for me and see if there are any obvious mistakes?

What have you learned from your experience in Japan? — Well, meeting people from another culture ___ be very difficult.

I called you yesterday evening, butthere was no answer.—Oh, I am sorry I _____dinner at myfriend’s house.

193. What they need at present _______science and technology.

Each boy and girl _____ a new book.