_______ the difficult maths problem, she has consulted Professor Liu several times.

Had I known about this computer program, a huge amount of time and energy _____. [ ]

n Province, ________ in southwestChina and ________ an area of 485,000 kilometers with the largest population inChina, is one of the largest and most inaccessible provinces in China.

“ We have _______ art festival this month.” “ Wow, that’s cool.”

We’ve booked a room in the center of town for the guests ______they can stay for three days.