By visiting these countries, their children can understand that the United States is far ahead of the world at large in terms of ______ .
举一反三
- 9. _______ from other countries can’t work in the United States without a permit.
- The United States has a large
- In world economy， the G7 refers to those seven countries with the world's largest developed economies — France， Germany， Italy， Japan， the United States， the United Kingdom， and Canada， — all of which are trade powers of the world.。（ ）
- When visiting a home in the United States, it is not customary to bring ___________. Instead, _____________ are standard in the United States.
- Three large privately-owned networks in the United States are __________.