They usually spend two hours _______ their homework every day.A. do B doing C to do
—Do you think I should get a good camera ?—Yes , of course ._______, you also need a good map and comfortable shoes.
Many countries are using natural gas , wind and other forms of ________ .
—Where are you hurrying ?—To take the driving test . — ____________ .
These young orange trees need special care _______ they can live through winter .
—Can you tell me _________________?—Sure , she is a nurse in No.1 hospital .