You _____ read a book in the sun—it'll do harm to your eyes.
—What made ber so sad? —______a good chance to go abroad.
You can come here to ask me ________ if you have any questions.
They put_______on the government to lower taxes and give laid-off workers necessary health care.
All Paul’s money had been ________,so he had to make a living by begging.
Though he failed in the experiment again and again, he didn’t______, and at last, he made it.