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

oing to the post office.—you’rethere, can you buy me some stamps

President Hu Jintao said economic growth is the basis for strengthening defense capability, which is ________ an important indicator of overall national strength.[ ]

Thanksfor listening to my problem and ________ me your valuable advice.—__________.

Excuse me, are you Tina — .