There is ’s’ and ’u’ in the word’ understand!
| A．a; a | B．an; a |
| C．a; an | D．an; an |
Mary often gives us _____ by email.
| A．some good information | B．some good informations |
| C．good informations | D．a good information |
_____ your sister _____ playing the piano these days?
| A．Is, practise | B．Does, practises | C．Is, practising | D．Does, practised |
The news I am going to tell you _____ very surprising.
| A．to be | B．is | C．are | D．were |
I don’t know _____ tomorrow. Can you tell me?
| A．when we started | B．when did we start |
| C．when we will start | D．when will we start |
My father didn’t go to bed ______ he washed his car last night.
| A．until | B．after | C．when | D．since |