---Do you think the weather will be all right this summer?---No, _______ we’re lucky. The newspaper says it’ll be very hot anyway.
The pen ________ he is writing is mine.
Can you lend me the book ________ the other day?
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?