1.Hoang will be eighteen next month

It will be...............................................................................................

2.Do you have a better refrigerator than this?

Is this.......................................................................................................

3.Don 't forget to bock the front door before you leave

Be sure.........................................................................................................

4.Math is a more difficult subject than other ones

No subject is..................................................................................................

5.I am very glad to see you all again

It's...................................................................................................................