I can't drive a car now, but I_______ able to do it in 2015.
More and more people find ______ necessary to protect our earth.
My father has ______ for two weeks.I miss him so much.
The listening test usually ______ 20% of the English test.
—What’re the rules in class?—First, mobile phones can’t be ______.
—Could you please______?—Yes, sure.