It’s believed that there will be ____ time in the future when ____ man can invent everything that they need.
A. a; the B. a; / C. /; the D. /; /
--I once got lost during my first visit to Beijing.
-- Oh, did you? You ____ me as your guide.
A. might have asked B. could ask C. would have asked D. would ask
There is little chance ____ the basketball player will recover from his injury in time for the next game.
A. whether B. that C. which D. how
The concert was a great success--there wasn’t a single empty seat in the concert hall, ____ it was very cold.
A. because B. when C. unless D. although
The old lady had two clever sons, ____ did a good job in the 2010 National College Entrance Exam, though.
A. none of them B. both of whom C. none of whom D. neither of whom
Millions of people watched that first moon landing on television, their hearts in their mouths, aware of how difficult and dangerous an adventure it was, and what risks had to be ____.
A. taken B. take C. to take D. taking
