It has been much easier for me to go to work________ shared bikes appeared．
But they also caused plenty of problems．( )
A．sinceB．beforeC．unlessD．though
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
Good news! Another new member in the Beidou family was sent into space．
Scientists tried their best to pay attention to every detail． To them， ________．（ ）
A．it never rains but it pours
B．a friend in need is a friend indeed
C．a miss is as good as a mile
D．the grass is always greener on the other side