The reason __________ he is late is __________ there was a breakdown on the railway.
I’d like to know ________ Chinese.
— Must I finish my homework before class is over?— No, you ______. You can hand it in tomorrow.
--Will Anna attend the party?--If her husband doesn’t go, _________she.
The mother often tells her son to be a good boy, warning him to _____ trouble.
This heavy rain made______ impossible_______ us to complete the task on time.