________ can help people be strong.

Our country is developing at an amazing speed，which is________makes me feel so proud.

If you _____ to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.

(2014·湖南十二校联考)I got an e­mail from my old friend last Sunday.Until then，we________in touch for nearly 3 years

The art club is for members only. You can’t go in ____you are a member.