Jim has retired, but he still remember the happy time _______ with his students.
to spend
spend
spending
spent
---- What do you think of a house supplied by Lovell ? ---- _______ you buy a home from Lovell, the company promises to buy it back at the same price after three years.
Had the government limited the sales of cars much earlier, traffic jam and pollution _______so serious now.
____today, he would get there by Friday.
Had they known what was coming next, they _________second thoughts.
Had you taken it more seriously, you ________ such a silly mistake.