. -- Do you think Allan came by taxi?-- No. If he had, I don't believe he ______ his bike here.
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?