Sometimes you will never know the true value of a moment ______ it becomes a memory.
A. though B. when C. unless D. until
It’s a good idea to send the old books _________the children who need them.
A. at B. of C. to D. by
（2017·江苏宿迁·14）—Mum，________ of my classmates ________ glasses.
—Oh，my God. You need to protect your eyes well.
A. threefourths；wears
B. threefourth；wear
C. threefourth；wears
D. threefourths；wear
—What do you think of the science exam?
—Very difficult! We all find ______ the most difficult one we have ever taken.
A．this B．that C．it D．/
The mobile phone sells for ￥5,000,it is much more than its _____ .
A. cost B. price C. value D. money
Russia, ______ eastern European country, is chosen to be ______ host of the 2018 FIFA World Cup.
A. an; the B. an; / C. the; a D. /; a
