A low-carbon（低碳）lifestyle has an effect our daily life. More and more attention
has been paid to energies these days.
A. in; save B. in; saving C. on; save D. on; saving
The teachers ________________ the office for a few minutes when we arrived.
A .had been away from B. had left C. have been away from D. have left
---Mum,_______ I watch TV?
---No. Unless your homework _______________.
A. could;
finishes
B. can; will fin
ish
C. may; is finished D. can; will be finished
__________terrible luck he had yesterday!
A. How B. what C. How a D.What a
Yesterday I met Jim. We ____________ each other since we _________ middle school.
A. haven’t seen ; finished B. haven’t seen; finishing
C. hadn’t seen; finishing D. hadn’t seen; finished
---When did you return to China?
---_________________.
A. Until next week B. Not until next week
C. a few days ago D. for a few weeks
