I’ll never understand how it _______ that you were an hour late on such a short trip.
| A．came on | B．came about | C．came out | D．came over |
When I ______to take part in the sport, I felt very surprised because I had never done this before.
| A．was chosen | B．chose | C．has been chosen | D．had chosen |
I asked her ______ I should do to lose weight, and she told me to balance my diet.
| A．why | B．that | C．what | D．how |
— Do you know the old man ______ on the bench over there?
— He is my grandfather.
| A．sit | B．sat | C．to sit | D．sitting |
If you don’t learn to think _____ you are young, you may never learn.
| A．when | B．where | C．what | D．which |
A new way of teaching _____ in the article can make learning easier.
| A．introduced | B．has introduced | C．was introduced | D．is being introduced |