In fact he knows this place very well, for he ________ there three times.
| A．has been | B．has been to |
| C．has gone | D．has gone to |
______ weather stops me, I go for a walk every day.
A. Unless B. If C. As long as
---May I go out to play with my friends now, Dad?
---No. You ______ let your mother know first.
A. may B. need C. must
Look! So many passengers on the underground ______ their phones.
A. play
B. are playing
C. have played
I really can’t see anything, the student in front of me is ______ of my view.
A. on the way
B. in the way
C. out of the way
A study shows a ______ walk every day can keep people from becoming fat.
A. 30-minute
B. 30 minute’s
C. 30 minutes’