Tom. Mary can’t open the box. can you give ______ a helping hand?

“What time does the plane _________?”“I think at about 10 o’clock.”

There is no doubt ________ those who work hard will succeed sooner or later.

When _______ you _______ to learn to skate?–Five years ago.

_____ will you go back from Hong Kong?—In 3 days.[ ]