small, the country has _____ plants from desert grasses to tropical jungle.

has inproducing clones of cows and goats, and continues to research ways _______can benefit mankind

I really don’t know _______ I put my wallet

Xiao Zhang has ______homework every day and she really doesn’t know ______ first.

We are really disappointed to see millions on earth who have nothing but hunger and cold __________ no chance to improve their life .