—Do you think it’s a good idea to make friends with your students ? -- ________,I do .I think it’s a great idea .

. Come _____. I’ll introduce my _____friend, Bob, to you.

Though having failed several times, Tim, who didn’t give up his dream, _____ made his dream come true.

.．As is often pointed out, knowledge is a two-edged weapon which can be used_____________for good or evil.

—“Could we put off the meeting?” she asked. —“ ____ ,” he answered politely. “This is the only day everyone is available.”