Which of the following signs is used to tell people to save water?
A. 
B. 
C. 
D. 
He was ______ tired ______ go on walking.
A. so, that B. such, that C. too, to D. as, as
Have you ever read books ______ by Lu Xun?
A. writing B. written C. are written D. writes
—It’s too late. I have to go now.
—Oh, it’s raining outside. Don’t leave ______ it stops.
A. since B. until C. while D. when
—Thank you for the nice birthday present.
—______ .
A. Don’t say so. B. You’re welcome
C. Thanks a lot D. No problem
There are ______ floors in the building and my home is on the ______ floor.
A. twenty; fifteenth B. twenty; fifteen
C. twentieth; fifteen D. twentieth; fifteenth
