If a computer crashes,you will lose the file you _____ on if you don’t save it early enough.
. —Who did you spend last weekend with? —________.
. —Mike, what did our monitor say just now? —Every boy and every girl as well as teachers who________to visit the museum asked to be at the school gate before 6:30 in the morning.
. .—Can those ________at the back of the classroom hear me? —No problem.
. Animals suffered at the hands of man________they were destroyed by people to make way for agricultural land to provide food for more people.
. Ten minutes earlier________we could have avoided the accident.