The writer found ________ difficult ________ English.
| A．it’s ; learn | B．it; learning |
| C．it’s; learned | D．it; to learn |
I know this plan is far from perfect, but I just can’t think of _______one.
| A．a better | B．the better | C．a best | D．the best |
Mr.Smith, together with his two sons,_____Shanghai for about five months.
| A．has left | B．has been away from | C．have left | D．have been away from |
— Air quality in our city is becoming worse and worse.
—Yes. These days' PM2.5 readings are frightening. We must do something to ______air pollution.
| A．reduce | B．remove | C．collect | D．gather |
---Do you like tea or coffee?
--- coffee. I prefer coffee ______ milk.
| A．to | B．with | C．of | D．in |
What _____ good time we had________ a picnic yesterday!
| A．a;had | B．\; having | C．a; having | D．\; had |