It was along the Mississippi River ________ Mark Twain spent much of his childhood.
A. howB. whichC. thatD. where
________ matters most in learning English is enough practice.
A. WhatB. WhyC. WhereD. Which
You ________ be tired—you’ve only been working for an hour.
A. must not B. won’tC. can’tD. may not
More than a dozen students in that school ________ abroad to study medicine last year.
A. sentB. were sentC. had sentD. had been sent
________ how to do the homework, I went to ask my teacher for help.
A. Not knownB. Not knowing
C. Not knowD. Not being known
The children loved their day trip, and of all the activities they enjoyed the horse ride ________.
A. mostB. moreC. lessD. little
