He _____ more than 5,000 English words when he entered the university at the age of 15.
.Frank put the mediocre in the top drawer to make sure it would not be_______ to the kids.
.I can_____be a teacher. I’m not a very patient person.
. The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.
. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
. It seems that living green is______easy and affordable. A small step masks a big difference.