__ It is so late. Our son __________ be back .
__ Don’t worry . I dare say he ________ have some extra work to do.
| A．can ; must | B．will ; might | C．should ; must | D．must ; may |
（届江西省重点中学盟校高三第二次联考英语试卷）34. He wrote a long letter ___he explained what had happened in the accident.
| A．what | B．which | C．where | D．how |
Barack Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from Fudan University and Tongji University.
| A．them | B．whom | C．which | D．those |
3．Lily took a few friends to my birthday party，none of __________ I was familiar with．
| A．which | B．whose | C．that | D．whom |
.Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, _________ the number of people infected with the virus is going up sharply.
| A．when | B．that | C．so that | D．where |
（重庆一中高三下第三次月考）13. There are many smokers in China, _____ the number of students who pick up this habit _____ increased a lot.
| A. where; has |
B. which; has |
C. where; have |
D. as; have |