My uncle’s house in the downtown area is much smaller than ours, but it is twice ______expensive.

The scientist has made quite a few discoveries, ______ of great importance to the whole world.

 ____________ to do the repair, and what you need is only a hammer and some nails.

The reason ________they were fired was ____they were not honest.

—Did you receive the letter the next day?—No. Somehow, it was three weeks ________ I received it.