Tom was ______ that he couldn’t understand ______ difficult sentence.

My friend and I are interested in drawing, but of us is good at it.

I forget to bring a pen, wouldyou lend me ____?

Tmall.com is booming, especially during the festivals，______________ price and variety, it is superior to other online shopping sites, like amazon.com and 360buy.com

The eggs in this box are heavier than _______ in that box.