Some people hold the view that the new machine is advanced, while others are still skeptical _____ whether it is of practical use.
The two giant pandas are so much alike that it is impossible to ________ one from the other.
—Did you look up the time of the trains to Shanghai? —Yes, the early train is ________ to leave at 5:30 am.
________ ,loss implies gain; on the other hand, gain implies loss.
he nurse who is ________ the girl has ________ ill since last week.
I can't finish the experiment by myself, so the honour ________ to all the members in our team.