I find _____ difficult for us to master English if we don’t work hard.
I’m willing to lend you a hand__________busy I’m for the moment.
—__________you like the car so much,why not drive it back? —Well,I can’t afford__________car.
__________there are only 20 minutes left before the train left,I felt uneasy in the taxi to the railway station.
__________ problems you have,you can always come to me for help.
Plants grow best__________it is warm and wet.