Some frightening pets _________ be kept home so that they won’t hurt others.
| A．can | B．may | C．must | D．need |
--- I called you yesterday but you weren’t at home.
--- I ______ flowers in my garden at that time.
| A．water | B．am watering | C．watered | D．was watering |
If you really want to pay me back, I hope ______ you see someone in need, you should give him a hand.
| A．whatever | B．whenever | C．however | D．whichever |
--- The little girl dances so well. Where was she trained?
-- She learns all by herself. She ______ goes to any training class.
| A．usually | B．often | C．even | D．never |
--- When shall we go to West Slender Lake, this afternoon or tomorrow morning?
--- ______ is OK. I’m free these days.
| A．Both | B．All | C．Either | D．Neither |
Traffic is heavy and the price of oil is much ______ so that many people go to work by bus instead.
| A．higher | B．high | C．more expensive | D．expensive |