1.-How many times__you__(be) to the Great Wall?-Only once.I__(go)there 3years ago.
2.I think you__(forget)the date.haven't you?
3.How Often___you__(drink)milk?
4.Look!My little brother __(feed0the lambs.
5.Jane has finished __(write)to the letter.Let's__(taking)her to the concert.
6.They __(have)an English class at 9o'clock yesterday morning.
7.She__(be) to the Great wall twice.