Nowadays an increasing number of parents _____ great value to the balanced development of their children.

________ has helped to protect the environment is worth praising.

Great inventors don’t ________ graduate from famousuniversities. Some didn’t even go to university.

What do you think of the sad news—Well, I was __________ shocked when I heard it.

Neither I nor Amy ______ to attend the business conference if we are busy.