Siberian Tigers ________ and killed at such a speed that they will disappear from the earth in the near future

The final exam is coming, but my daughter’s Chinese is not good.-Don’t it. You can ask her to do more reading and I can also help her.

25He is one of the old scientists who ______nothing about his personal income and fame

Excuse me. Could you tell me _______ the Blue Mercury(蓝水星) — About an hour.

Water can __________ and release a lot of heat without big changes in temperature, thuscreating a stable environment.