There’s been a substantial _______in doctors ’ methods since last generation.A) incr

There has been a collision ___ a number ？

There has been a collision ___ a number of ？

If there __________ no air, people would die.A、wereB、isC、beD、been

一____________？一I’v never been there but I hope to go there in the future.A .Where are

－－－ ______？－－－ I’ve never been there but I hope to go there in the future.A. Have you b

In the past decades there has been a big_______.A