He usually ________ camping at weekends. But last weekend he ________ the room at home. ( )
句意：在周末他通常去野营，但是上周他在家打扫房间。野营 go camping，主语是单三人称，动词应该用单三动词 goes，第 2 句时态为一般过去时，动词应该用过去式 cleaned。C 符合题意。故选 C。
2018年12月，张阿姨把4000元的存入银行，定期三年，年利率是2.75%到期后，应得利息______元.
Don’t leave anyone ________ (back/ behind). We are in a group.
Tomorrow we’ll have a school trip. But Sally _______ (has to/ had to) stay at home to look after her sick mother.
__________ (Be quick / Don't worry), Tom! You have a lot of time for your work.
We all want to live in a city with __________ (many cars / fresh air).
There are many interesting places in Australia. _______________ (The Great Barrier Reef / Stonehenge) is a good place to visit.
Washing hands _____ (before / after) dinner is a good habit.
Look! An old lady ________ (carries / is carrying) a big bag on her back.
Food ______ (safely / safety) is very important for all of us.
At the Dragon Boat Festival people usually eat ________________ (rice dumplings /dumplings).
