sigh over the small achievement_____ , and I’m sure if you keep at it, you’ll see the light at the end of thetunnel!

h having discussed it for long, they still haven’t reached an agreement ________ they should pour more money into the project

I have an interesting book.

He feels lonely because he has no close friends ____.

下列所给的句子不属于病句的一项是（ ）