____ do you clean your room—Every two days.

Tom assured (向……保证) his boss that he would _____ all his energies in doing this new job.

The elderly need special care in winter, as they are _____ to the sudden change of weather. [ ]

Mom, my classmates invited me ____ a field trip. MayI go with them—OK.

Experts think that ________recently discovered painting may be ________ Picsso