Susan decided not to work on the program at home because she didn’t want her parents to know what she_____

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

trees grow tall by pruning. _____, a child needs education to become a personuseful to society.

.We were about to go downstairs when the lights_________.

　　　I got home,I found I had left my jacket on the playground.