The incomes of skilled workers went up .        , unskilled workers saw their earnings fall.

. Just like a voyage at sea, our life journey, ______ time is limited, is full of difficulties as well as opportunities.

_____you have to do the job, you should try your best to do it well  even though it may be very difficult for you.

The real threat of fraud(欺诈) on the Internet has highlighted the fact ________ consumers fear shopping on line.

        cycling is a fantastic way to burn a few calories and save some money, there still exist risks．