No matter how ______，scientists are eager to know more about it by exploring.

The duty of Project Hope is to help poor children, isn’t it?–Yes, it has built many schools ____ those children can study happily.[ ]

If people cutting down the forest, they will have nowhere .[ ]

What ____ he_____ last weekend?— He went to a movie.

John and I will celebrate our fortieth wedding anniversary next month. — Oh, ________!