There is no juice in the fridge, _____–No, we’d better go and buy some.

It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.

He _______ English by making word cards. But now he _____ it by listening to tapes.

Thank you for offering a great deal of _________ to me in my research.—It was my great pleasure.

He devoted as much time as he could _________ English.