He started to learn English in 1990 and in the years ________ he kept on using it in his work.
I'm examining the composition he has just finished ____ the possible mistakes in it.
The prize of the game show is $30,000 and an all expenses __________ vacation to China.
She's too thin. She ____ gain some weight but she _____ too little.
--- Mum, why do you always make me eat an egg every day ?--- ____ enough protein and nutrition as you are growing up.
He transplanted the little tree to the garden _____ it was the best time for it.