_______ several times, but he still doesn’t know how to do it properly.
A. Being shown B. Having shown him
C. Having been shown D. I’ve shown him
― Have you finished your composition already, Jack?
― Yes. I _____ it within half an hour.
A. have finished B. finish C. finished D. will finish
With the development of science, more new technology to the field of IT.
A. has introduced B. is being introduced
C. is introduced D. was introduced
It looks like the weather is changing for ______. Shall we stick to our plan?
A. the worse B. worse C. the worst D. worst
I wanted some paper but there was _____ in the house.
A. nothing B. none C. no one D. not one
Many lifestyle patterns do such great harm to health that they actually speed up ______weakening of the human body.
A. a; / B. /; the C. a; the D. /; /
