He knew the problem was serious and promised to look into it _____ he reached office.

_______ can a tiger weigh, do you know? — Yes, I know that a big one can weigh over 300 kilos.

____ early，and you won’t be late for school．

I don’t like the color of this sweater. Would you please show me __ one?— Here you are.

How often do you eat out?—________, but usually once a week.