Bob said he was going to join our club but he didn’t. What a shame! He ______ his mind.
| A．can’t have changed | B．mustn’t have changed |
| C．wouldn’t have changed | D．shouldn’t have changed |
_______the Teachers’ Day ,the students are cleaning the classroom.
| A．In spite of | B．In celebration of |
| C．In search of | D．In place of |
I need to get another dictionary, because cover is dirty and page is missing.
| A．a; a | B．a; the | C．the; a | D．the; the |
—I often see him working hard in his spare time.
—________he has won the scholarship from time to time.
| A．No wonder | B．No doubt | C．No way | D．No problem |
Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
| A．showed | B．will show | C．has shown | D．is showing |
Is it only on the world market ________we can prove the competitiveness and quality of our goods?
| A．where | B．which | C．that | D．how |