Mark Twain worked for several years as a pilot on a steamboat, taking passengers up and
down the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
| A．as | B．what | C．which | D．who |
You’ll have to spend writing your report here.
| A．one day or two days | B．one day or two | C．a day or to | D．two days or one |
A non-smoker can hardly imagine__ pleasure of having__ smoke after a meat.
| A．1, a | B．a, a | C．the, a | D．1,1 |
He has lived at for 30 years.
| A．No. 101 heping Street | B．101 Heping Street |
| C．Heping Street 101 | D．Heping Street No. 101 |
.They have their reasons for keeping their marriage___ secret for ___ moment.
| A．the; a | B．the; the | C．a; the | D．a; a |
Either the boy or his sister must have dinner here.
| A．his | B．her | C．their | D．theirs |