If Peter ________ harder in the senior high school, he would be a college student now, too.
What impresses me most is ______ he appears in front of others, he wears a sincere and charming smile.A.which B.that C.where D that whenever
____ difficulties we meet, we can work them out.
The meeting was expected to start at 9 o'clock but the manager didn't turn up ______ twenty minutes later.
She found her calculator ________ she lost it.
The WTO cannot live up to its name _______ it does not include a country that is home to one fifth of mankind.