Nowadays, we have tons of high-tech gadgets to help us keep connected to our friends and family. Many of us have cellphones to ___16__ calls and write text messages; the Internet to chat with friends and __17__ e-mails. But being in touch with your friends and family also means __18__ in touch with some strangers. We often get spam(网上垃圾邮件) in our inbox, calls from strangers, and messages from __19__ people. So what should we __20__ with all of these?
__21__ you might want to answer the call from an unknown number, or respond to the message from someone you don’t know, try __22__. You are not sure __23__ they are contacting you, and it could be ill-spirited. It is __24__ not to respond to calls or messages from numbers that you are not familiar __25__. The same rule applies to (应用于) e-mails. There are many people who create viruses that __26__ harm your computer, and these viruses are disguised(假装) as e-mails. __27__ opening these e-mails, you are risking getting a virus __28__ could destroy your computer.
In other words, all the new technology is great for keeping in touch, but also comes with some bad things. __29__ yourself out of trouble, it is best to __30__ from messages and calls that you don’t know.

A．make B．do C．receive D．ring

A．write B．send C．answer D．read

A．to be C．be D．are

A．known B．well-known C．unknown D．better-known

A．manage B．compare C．deal D．do

A．But B．Since C．Because D．Although

A．not B．not doing C．not to do D．not to

A．that B．what C．why D．how

A．most dangerous B．safest C．necessary D．valuable

A．by B．with C．at D．into

A．should B．could C．would D．need

A．In B．By C．With D．At

A．that B．what C．if D．whether

A．To keep B．Keep C．Keeping D．Kept

A．refuse B．get close C．stay away D．stop