Security devices at airports are ______ to spot weapons that could be used by terrorists.

No student______ go out of school for snacks during the break without the teacher’s permission.

orth downloading, because it’s freeand doesn’t__________ a lot of disk space.

How do you like the book —You mean the book _______I bought yesterday I haven’t finished it yet.

–Why must you go shopping in such weather–My coffee has _____.