------ Bob failed in the exam again . ------ He _____ it ; he never worked hard .
Ladies and gentlemen, please fasten your seat belts. The plane________.
Look at the timetable. Hurry up! Flight 4026 ____ off at 18:20.
—Shall I help you, sir? —I appreciate ____ if you do me the favor to pack the luggage.
Helping others is a habit, ___ you can learn even at an early age.
The new group of students are better-behaved than the other group who stayed here___