Many kinds of help ________ by plane or by train to the area ever since the earthquake hit it.
The patient’s progress was very encouraging as he could ________ get out of bed without help.
In my opinion, your composition is not as interesting as his but yours is ________ in writing.
---We all had a lot of fun at the barbecue yesterday. Pity you weren’t there. ---I really should have gone with you, but I ________ on some remaining problems.
If you want to study the nature of the universe, first of all, you must be clear about its ________.
---Do you think I can pass the test? ---________, I’m afraid.