The train starts _____ 6:20，so you’d better get there before 6.
The train starts \_\_\_\__ 6:20，so you’d better get there before 6.
时间点
Now I _____ to work by bike instead of by car as there are too many cars on the road in rush hours.
Now I \_\_\_\__ to work by bike instead of by car as there are too many cars on the road in rush hours.
—Did you catch the first bus this morning?—No. It had left the stop _____ I got there.
—Did you catch the first bus this morning?—No. It had left the stop \_\_\_\__ I got there.
It is ten years _____ Miss Green returned to Canada.
It is ten years \_\_\_\__ Miss Green returned to Canada.