They usually spend two hours _______ their homework every day.A. do B doing C to do
---It’s 12 April today. Have they found any useful information about the plane's black box?---Flight MH370? Yes, but it’s difficult to decide where the black box really is.
______ I have a quick word with you? Something important has happened.
The girl in black trousers _____often noticed ______the teachers’ office.
In those days, we had no phones, so we had to keep in touch ________ letters often.
--- Did you have a sound sleep last night?--- Yes, never slept ________.