Do you know if Tom ________to the concert— I’m not sure, but if he________, I’ll go to the concert with you.

With more forests being destroyed, huge quantities of good earth each year. [ ]

Is this ruler —No, it isn’t. is yellow,it’s .

s research, two are _____, andthe others are _____.

Shall we go to spend the winter holiday in Sanya—_______ There must be too many people there.