Did you go on the Silk Road trip by train？

Yes． The train was great， just like a hotel_____wheels﹣it had all that I needed．（　　）

A．inB．atC．onD．by

Wow， you've made so much progress in drawing．

Thanks． I______two online courses this winter holiday．（　　）

A．tookB．will takeC．takeD．was taking

I don't really like big cities．

Neither do I． I feel much_____in the countryside．（　　）

A．freeB．freerC．freestD．the freest

The doctors and nurses managed_____the lives of patients， though they didn't have enough medicine．（　　）

A．saveB．savingC．to saveD．to saving

I don't care how many words there are in your article， but the_____of it really matters．（　　）

A．abilityB．sizeC．qualityD．energy