شرکت در آزمون آنلاین انگلیسی 3 - درس سوم | آزمون شماره 206

The Christmas Cards ............................... to all our customers tomorrow morning.

We should be very careful with .......................... to remain them for next generations.

Successful business is started when you .................. a strategy for making money.

In countries with lack of natural ............................. , designing products to replace them is essential.

After many searches in the Internat we found out that there was no ............................... that proves people and governments are hurrying to solve air pollution .