In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.
| A．give in | B．give off |
| C．give away | D．give up |
.Just as I was leaving the classroom, it ________ to me that I forgot to turn the lights off.
| A．happened | B．occurred | C．hit | D．struck |
.I’ll never forget the years______I lived in the country with the farmers,______ has a great effect on my life.
| A．that;which | B．when;which | C．which;that | D．when;who |
By the time my parents reached home yesterday, I _____ the dinner already.
| A．had cooked | B．cooked | C．have cooked | D．was cooked |
You should make it a rule to leave things ______ you can find them again.
| A．when | B．where | C．then | D．which |
Heasked_______ any elephants in the zoo the day before.
| A．if did you see | B．if you had seen | C．whether did you see | D．that you had seen asked |