As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.
Chongqing is larger than ________city in China.
________I’m concerned, we are going to take an exam in a month.
--Thank you for your help. -- _________.
He put forward a good idea ________ gave us hope.
Rather than ____on a crowded bus, he always prefers _____a bike.