—It is _______he often fails in exams_______ makes his parents worried about him.—So, he has to work whole-heartedly.
At the party,John made up a joke,________ people burst out laughing.
That is the day ________ I'll never forget.
Do you know the year ________ the Chinese Communist Party was founded?
This is the hotel ________ last month.
Do you know the man ________?