Do you know when Dr Smith_____for dinner this evening?—-No,but I think he _____when he is free.

If you go by train, you can have quite comfortable journey, but make sure you takefast one.

I’ll tell you _______ he told me last week

Our teacher wouldn’t give us the answers _____ the questions directly.— ____ work them out by ourselves?[ ]

To tell ______ truth, he is at ______ loss what to do currently．