I ______ the streets in our neighborhood this time yesterday when you called me.
A. was cleaning B. have cleaned C. am cleaning D. would clean
China ______ its first successful landing of a fighter jet on the Liaoning (“辽宁号”航母) last year.
A. celebrates B. celebrated C. is celebrating D. will celebrate
-_______ can the batteries (电池) keep these cool iPhones and iPads working?
- For about ten hours.
A. How much B. How many
C. How long D. How often
South Korean first female president, Par Geun-hye(朴槿惠) promised _______ her best to serve people.
A. do B. doing C. did D. to do
Detective Ken interviewed Jill and Jenny. They both denied ____ the vase.
A. steal B. stole C. stealing D. to steal
We _____ obey the new traffic rules to improve our road safety.
A. can B. must C. need D. may
