—Have you forgotten anything，sir? —Oh，I forgot to pay.You see，I'm terribly sick，but I ______ to.

–This is the first time I _____ pictures with you .–Now it is time that you ______ a picture for me .

---- Have you finished your report?--- Yes．I _____ it within 10 minutes．

In the past few months, the country _____ a further tightening of supply restrictions, making fuel and food supplies more difficult to obtain.

Stop! You can never touch this machine when it ________, it is very dangerous.