This is the first time that I _____ the summer palace.
The professor, _____ some of his assistants, _____ to attend our discussion this afternoon.
______ is often the case, we have worked out the production plan.
He didn’t make ________ clear when and where the meeting would be held.
In an attempt to save money, some housewives like to go from shop to shop to search for real _______.
I still remember the days___ I spent ______ with you in Beijing.