Who helped Betty tidy up the bedroom just now—_________. She cleaned it all by herself.

We shall not start the project until it __________ by the committee.

that the drowning child was struggling in theicy water, the soldier dived into the river without hesitation, ___ his ownsafety

Theresearchersfoundclearandconvincingevidence_________happinessisthekeywhenitcomestobetterhealthandlongerlives.[ ]

I can’t follow our new foreign teacher in class.- . Listen more.