—Many people prefer to shop online because it’s __________ and can help people save ________ money.
There used to ________ a clean river in the village, but now it’s dirty.
--- Thanks for asking me your party. --- ______ .
David talked with a friend of ____ on the Internet for a long time yesterday.
--- The windows are broken and need to be repaired. --- I think so. They can hardly _____ the cold now.
On holidays, they prefer to _____ at home rather than _____.