Fred entered without knocking and, very out of breath, sank _______ a chair.
iPhone 6s have been on sale for over a month, but they are still hardfor Chinese.
Sometimes we need true friends’ shoulders ____we can cry to free ourselves from pain.
If we don’t often use the newly learned words, we’ll _____ forget them.
It is widely____ that hard work can help students make progress.
Hong Kong’s Occupy Central protesters(抗议者)______ roadblocks on the main roads and they brought trouble to the public.