Two thirds of the earth _____ covered with water. [ ]

you and your sister sing English songs—No, we can ‘ t .

To make sure the relics in the museum are well-preserved Tibet’s cultural preservation institutions have _____ modern technologies to monitor the conditions of the relics. [ ]

Have you seen the movie《Lost in Thailand》— Yeah, it’s truly worth ________. It’s ________interesting that I’ve seen it twice.

–What do you think the noise was? –It ___________ a cat.