Hearing that he would have to be given another injection, the boy _ a smile to cover up his fear.

Where would you like to go on vacation, Sam—_________.

So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard

The knee is the joint ______ the thigh bone meets the large bone of the lower leg．

Why? Tom, your shirt is so dirty! — Mum, I ______ my storeroom downstairs