—Shall I invite Tom to my party? —Yes. It’ll be nice if you .
| A．to | B．invite | C．will | D．do |
. My parents live in a small village. They always keep candles in the house __________ there is a power cut.
| A．if | B．unless |
| C．in case | D．so that |
.Many of them turned a deaf ear to his advice, __________ they knew it to be valuable.
| A．as if | B．now that |
| C．even though | D．so that |
. 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 |