(A)用所给词的正确形式填空
1. Should iPads ______ (allow) in school?
2. Children ______ (should not allow) to swim alone here.
3. What ______ (should do) to plastic bags?
4. All that ______ (can do) has been done.
5. Never put off till tomorrow what ______ (may do) today.

be allowed
shouldn't be allowed
should be done
can be done
may be done

(B)用括号中所给动词的适当形式填空
1. People must ______ (stop) from cutting the trees.
2. This medicine should ______ (keep) in a cool place.
3. Many doctors are ______ (send) to the village.
4. Lessons learned easily are soon ______ (forget).
5. When we arrived here, all the apples had ______ (eat) up.

be stopped
be kept
sent
forgot/forgotten
been eaten