. So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.

Tomalways prefers _________on foot rather than _______ a bike

e languages, 100 words make up half of allwords _______in daily conversations.

______ drive after drinking. It’s too dangerous(危险的).—OK. I won’t.

do I need to feed the pet dog—Twice a day.