The maths problem is ______ hard for us ______ solve.
— Is Tom at school today? — No, he is at home ______ he has got a bad cold.
— ______ did you spend your summer vacation last year? — In England.
We traveled all night to London and got there _______ Sunday morning.
Tom and I went boating yesterday. _______ had a good time.
Would you please tell me ______ this book?