No one can exactly tell us what .

－So far, we __________ over 2,000 English words.－Really But I can’t remember all of them.

This is the best book _____ I have beenlooking for all this year.

Tom kept quiet about the accident ________ lose his job.[ ]

It was at this shop _______ I bought my skirt. Howabout coming to my home to have a look tonight