English is difficult________. Nobody can learn to use it in a few minutes.
| A．learning | B．to be learned | C．learned | D．to learn |
And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.
| A．having lost | B．losing | C．to be lost | D．lost |
I thought Jim would say something about his school report, but he ______ it.
| A．doesn’t mention | B．hadn’t mentioned |
| C．didn’t mention | D．hasn’t mentioned |
It is when the plane ______ that you’d better find out at the booking office.
| A．would take off | B．had taken off |
| C．was taking off | D．is taking off |
The baby is generally healthy, but every now and then he ______ a cold.
| A．has caught | B．is catching |
| C．will catch | D．does catch |
--- Each of the students, working hard at their lessons, ______ the book.
--- So have I.
| A．is reading | B．has read | C．reading | D．reads |