Hiking is ______ great fun. You will get close to ______ nature and take exercise at the same time.
—What do you think made Liz so upset?—__________ her new bike yesterday.
With the time __________, our happiness grew.
When he was 20 years old, he __________ doctor in the village.
With the popularity of smartphones, the micro blog __________ a good platform for the young to show themselves gradually.
—What worried him so much?—His hair is __________ grey.