It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.
| A．which; which | B．that; that | C．that; which | D．which; that |
.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 |
Kathy _______ a lot of Spanish
by playing with the native boys and girls.
| A．picked up | B．took up | C．made up | D．turned up |