The reason _______ he was late again was that he was caught in a traffic jam.
I want to buy a piano of high quality, _____ I can practise on every afternoon.
Is this watch _____ you wish to have _____?
There are two small rooms in the house, _____ serves as a kitchen
This is the very knife _____ I used to cut apples yesterday.
---- Is it high time that we _____ on the school building? ---- Yes, it _____.