Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A.are being uncovered | B.have been uncovering |
C.are uncovering | D.have uncovered |
It was half a year________my good friend returned to his hometown.
A.before | B.since |
C.that | D.when |
—When did you get home last night?
—It was almost midnight________we arrived home.
A.that | B.before |
C.since | D.when |
It saves time in the kitchen to have things you use a lot________easy reach.
A.near | B.upon |
C.within | D.around |
The questionnaire takes________ten to fifteen minutes to complete and can be used along with the assessment interview.
A.mainly | B.punctually |
C.approximately | D.precisely |
He stood up and________a smile to cover up his disappointment.
A.hid | B.managed |
C.refused | D.brought |