Betweenthetwopartsoftheconcertisaninterval,__________theaudiencecanbuyice-cream.
A、When__________ the convenience of digital payment, many senior citizens started to use smart phones.
Mycameracanbe_____totakepicturesincloudyorsunnyconditions.
-----Tommy is planning to buy a car.
----I know .By next month ,he__enough for a used one
Mr.Smithgradually_____aknowledgeofthesubject.
—Let'stakeacoffeebreak.
—__________We'vebeenworkingforhours.
