—Do you mind if I use your reference book?—No, ______.
At the evening party the host said _____ was able to solve the riddle could get a nice present as a reward.
Since 2012, when he _______, the soldier has been in the army.
As is known to all, Indonesia is an Asian country ______ a lot of islands.
Only when____ 30 years old _____ to learn English.
Gun control is a subject Americans have argued for a long time.