Chen Wei isn't at school today________ he is taking part in a robot competition in Shanghai.
A.after B.because C.before D.if
_______they may not succeed, they will try their best
A. Though B. When C. Because D. Unless
Peter likes reading a newspaper________ he is having breakfast.
A. until B. while C. because D. though
They will lose the game _______ they try their best.
A.unless B.once C.since D.after
Studying in groups is necessary _________________ you want to do well in school.
A.if B.until C.unless D.though
Eric arrived on time, _______ it was the rush hour.
A. though B. because C. while D. unless
