My sister met him at the street yesterday afternoon, so he __________ your lecture.

For everyone’s safety，we _______ a1ways remember the law against driving after drinking.

 -- Are these _______ all from No. 2 Middle School? -- Yes. They often _________ their free time to help the old here.

—Excuse me, where are we going to have our class meeting?—I’m not sure. Ask Li Hua, please. He _________ know.

The weather turned out to be fine yesterday. I _______ have taken the trouble to carry my umbrella with me.