—When did you last see Shelly?—On Sunday of last December at celebration of her 40th wedding anniversary.
It is uncertain side effect the medicine will bring about , though about one thousand patients have taken it.
—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there. — I really should have gone with you, but I ________ on some remaining problems.
The concert by Lang Lang was so well ______ that all the tickets had been sold out on the first three days last month.
She is a quiet girl at school,but sometimes she _____ be very naughty.
____ he met with the difficulty did he realize that our help was of great importance