My parents live in a small village. They always keep candles in the house ___ there is a power out.
| A．if | B．unless | C．so that | D．in case |
The police always take advantage of dogs’ ____ sense of smell to search for something.
| A．sensitive | B．sharp | C．practical | D．tremendous |
---I was riding along the street and all of a sudden, a car cut in and knocked me down.
--- You can never be ______ careful in the street.
| A．much | B．very | C．so | D．too |
A dozen ideas were considered _____ the chief architect decided on the design of the
building.
| A．because | B．before | C．whether | D．unless |
Scientists are trying to develop a special material, ________ they will make use of in
spacecraft.
| A．it | B．one | C．that | D．what |
He was absent for two weeks, so he had a lot of homework to ________.
| A．make up | B．put up | C．take up | D．pick up |