（） may be the first possible cause which makes the engine to lose power or slow down when it is running.

However careful one may be, he cannot possibly listen carefully to everything that he hears. There are 11 of reasons for this. ①One of them is the overload（超负荷）of messages most of us 12 each day. In addition to the numerous hours we 13 hearing other people speak, we may spend several hours listening to the radio or sitting in front of a television set.② 14, it is impossible to focus our attention completely on what is said; our mind might be 15 elsewhere. ③Preoccupation（先占，当务之急）with our personal concerns is 16 reason we don’t always listen carefully. A romance 17 sour or a good grade on a test may take prominence in our mind even as 18 is speaking to us. ④Furthermore, we are surrounded by all kinds of noises which interfere 19 listening. For example, voices at a party or 20 of traffic may simply make it difficult for us to catch everything that is being said.

I would be very much（）if you could arrange for a radio technician to come on board as soon as possible for my radar repair.

The strong wind will make us（）here for some days.

lf a park visitor is hurt or in danger, cell phones make it easier to get help.

Winning the game will make it possible for players to _____.

It is dangerous for vessels without the operational radar（）the estuary.

Is it possible for you to work late tonight? （）

（）means the sufficiency of a vessel in materials，construction，equipment，crew，and outfit for the trade or service in which it is employed.

In dense fog a vessel without operational radar may not be justified（）at all but should anchor if it is safe and practicable for her to do so.

In C language，(58) is a collection of one or more variables，possibly of different types， grouped together under a single name for convenient handling.

In C language,(70)is a collection of one or more variables, possibly of different types, grouped together under a single name for convenient handling.