When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
She as well as her brother ____ a League member.
An iron and steel works, with some satellite factories, ____ to be built here.
____ either he or I to attend the mass meeting this evening.
Either he or I ____ to attend the mass meeting this evening.
To play basketball and to go swimming ___ useful for character-training.