While working in the countryside , the students ________ a great deal of knowledge on plant life.
We’d be very grateful if you could join us because your cooperation will _____ the timely completion of our project.
My mobile phone disappeared. Where _____ I have left it?
My brother is always on medicine, so he has ___ table tennis to keep fit.
______the news, so far, has been good, there may be bad days ahead.
______ in March, that so many people had on their light wears.