Tim is often heard loudly in the next room．
Yes．Listen!You can hear him there now!（ ）
| A． |
to sing，singing |
B． |
sing，singing |
| C． |
singing，to sing |
D． |
to sing，to sing |
I don't care how many words there are in your article， but the_____of it really matters．（ ）
A．abilityB．sizeC．qualityD．energy
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 really like big cities．
Neither do I． I feel much_____in the countryside．（ ）
A．freeB．freerC．freestD．the freest
Wow， you've made so much progress in drawing．
Thanks． I______two online courses this winter holiday．（ ）
A．tookB．will takeC．takeD．was taking
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