The retired teacher is said to have returned from the USA, where he ______ by some of his old students.
| A．would be visited | B．visited | C．had been visited | D．have been visited |
_____________, the little girl can help her mother with some housework.
| A．Young as she is | B．Young as is she |
| C．As she is young | D．As is she young |
If you go on doing so, you’ll __________ yourself sooner or later.
| A．damage | B．destroy | C．ruin | D．break |
---Alice, why didn’t you come yesterday?
--- I______, but I had an unexpected visitor.
| A．had | B．would | C．was going to | D．did |
His parents are very concerned about his son at school because he _______moving in his seat.
| A．is always keeping | B．always keeps | C．does keep | D．has always kept |
--- _____ the population of China? --- About 1.3 billion.
| A．What is | B．How many are | C．How much is | D．What are |