_______you need any help, please don't hesitate to let me know.
is a good chance that I'I1 finish the work tomorrow.
Access the mountain-town is often difficult because of the bad roads.
Once out of the earth’s gravity, the astronaut is by the problem of weightlessness.
The doctor telephoned to say that he couldn’t ____ the meeting because he had to ___ a patient.
When we are in a new place, we must __our manners and try to follow the customs of the place.