4 . 选词填空（可变换形式）

tell...apart, all of a sudden, take action, be home to,carry out, vast amounts of, add...to..., log in

1. ______ some sugar ______ the meal when you are cooking; it will enhance the flavour.
2. Mark and Dave are twin brothers; I can only ______ them ______ by the color of their shoes!
3. At the beginning of this year, our government quickly ____________ to prevent the disease from spreading.
4. The board of the committee has already approved the business plan, so it will be ____________ next week.
5. The Rockies ____________ bears and mountain lions, so you'd better pay more attention when you travel there.
6. If you want to get further information, you can ____________ our home page on the Internet.
7. As is known, ____________ heat will be released when water is boiling.
8. They were watching TV when ____________ the power was cut off and they were left in the dark.