The book was so _____ that I couldn’t help laughing from beginning to end.

Why not stay at home the road is so slippery after the heavy snow? [ ]

In some cities the traffic police use computers to keep the traffic________smoothly.

Though there are some differences in American and Chinese education，both systems are__________excellent graduates.

ied hard to keep calm in face of thestudents, but the sweat on her forehead _____ her ____.