[单项选择]Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years.
A. how
B. that
C. which
D. what

[单项选择]Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years.
A. how
B. that
C. which
D. what

[单项选择]Although there arc many predictions about the future, no one knows for sure （） the world would be like in 50 years.
A. how
B. that
C. which
D. what

[单项选择]Although his many examples were all right, the remainder ______ not quite exact.
A. is
B. was
C. are
D. were

[单项选择]

Predictions of many robots in industry have yet come true. For ten years or more, manufacturers of big robots have explained how their machines can make industry mom competitive and productive. The maker for (21) robots is oversupplied now, and the driving force of the robotics(机器人学) revolution is (22) to be with makers of machines that handle a few kilos at most.
"Heavy-robot manufacturers are in some difficulty (23) finding ustomer. They are offering big (24) just to get in the door. There has been a (25) growth everywhere in the numbers of robots, so we admit we are either deceiving (26) or that the market is slowly growing. "said John Reekie, chairman of Colen botics. "The following things must happen (27) the robotics revolution to occur. We must achieve widespread robot literacy(文化), (28) there has been a computer (29) program, there must be a robot prices. (30) , some kind of arti
A. more
B. less
C. no
D. least