2D

This machine

4A

The difference between synonyms of "invitation" and "invitation" lies in the difference in style and color. The former is written language color, while the latter is spoken language color.

6 Excellent divers from China (1 building, right).

Excellent/China Divers (second floor, front)

China/Diver (3rd floor, right)

Diving/Athletes (4th floor, right)

Jump/water (fifth floor, moving objects)

7 subject-predicate sentence

In order to write my graduation thesis, I go to the library to look up information every day.

Tomorrow is my brother's birthday. I bought him a toy car.

C. We would be honored if you could give an academic report.

D. in order to ensure the quality of the project, he worked all night on the construction site, his eyes were red and swollen, like ripe peaches.

9 (Enough) Seek more wisdom, look at nothing (cliff), play with words (algae) and (clever) use (positive) audio and video, flowers are not (sick), and finally (11) use (good) comments in the Central Plains.