My car keys are possibly in the kitchen.

A. My car keys should be put in the kitchen

B. My car keys cannot be in the kitchen

C. I don’t know whether my car keys are in the kitchen.

D. My car keys might be in the kitchen

It was a mistake of you to lose your passport.

A. You shouldn't have lost your passport.      B. There must be a mistake in your passport.

C. You needn't have brought your passport.  D. Your passport must be lost.

It isn't obligatory to submit my assignment today

A. I mustn't submit my assignment today

B. My assignment must have been submitted today

C. I needn't submit my assignment today

D. My assignment is required to submit by today

In 1900 the world had no deaths from rabies. Scientists_____ wonderful vaccine.

A. has discovered              B. discovered

C. must have discovered D. should have discovered

She _________ , but luckily , a lifeguard spotted her and rescued her.

A. has drowned B. ought to drown C. could have drowned D. might drown

I would rather_____ poor but happy than become rich without happiness.

A. being B. be C. to be D. was

You're having a sore throat. You'd better_____ to the doctor.

A. to go B. went C. go D. going

He spent all that money last week. He_____ so much.

A. didn't need spend         B. didn't need spend

C. needn't have spent       D. didn't have to spend

He _____ all that money, so he could save some.

A. didn't need to spend      B. needn't have been spent

C. shouldn't spend             D. oughtn't to spend

I'd rather_____ in the field than_____ home.

A. to work/ to stay B. work /stay C. working/ staying D. worked/stayed