The lack of money forced them to________their research.
Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.
---How long will you stay here?---I don’t know. ________.
Since then the number of people taking driving lessons _______ 20%.
To our surprise, we got ______ people to attend the meeting as we had expected.
Ann never dreams of ______ a chance for her to go abroad.