Everybody in our class admires Lily, for she has a __________ for playing the piano.
| A．present | B．gift | C．ability | D．power |
It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
__________ he had not hurt his leg, John would have won the race.
| A．If | B．Since | C．Though | D．When |
I won’t call you, __________ something unexpected happens.
| A．unless | B．whether | C．because | D．while |
He was told that it would be at least three more months __________ he could recover and return to work.
| A．when | B．before | C．since | D．that |
Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |