—You look pale. What’s _______ with you? —I have _______ headache.
Many Chinese students found______ difficult to learn English grammar.
________ you can’t pass the exam?
If you don’t know how to spell the new word, please ________ in the dictionary.
I used to ______ in the morning, but now I’m used to _____ before going to bed.
Mr. Green has come up ______ a good idea to help his children get on well _______ each other.