—It’s difficult to tell this picture from that one.—Yes.The differences between the pictures are very________.

I hate people who __________ the end of a film that you haven’t seen before.

I always prefer _______ a bike rather than _______ to work.

 It is high time that we started to consider what ________  we should take to reduce heavy smog caused by traffic fumes and other pollutions.

(2013·宝鸡二检)In my brother's absence, I would like to thank all concerned on his ________.