It's the most beautiful painting I've ever seen. SEEN

=> I (a)   beautiful painting.

This summer has been much cooler than last year. COOL

=> Last summer (a)   this year.

This car isn't safe enough to drive. DANGEROUS

This car (a)   drive.

Steve didn't manage to complete his work. FAILED

=> Steve (a)   his work.

How long has she been studying English? BEGIN

=> When (a)   studying English?

We haven't arranged a date for the wedding yet. BEEN

=> A date for the wedding (a)   yet.

Experts estimate that most people now have access to the Internet. IS

=> (a)   that most people now have access to the Internet.

I think it would be a good idea if you joined the beginner's class. SUGGEST

=> I (a)   the beginners class.

I'll help you with your homework. MIND

=> I (a)   you with your homework.

I took the bus so that I wouldn't be late for the big meeting with the CEO. AS

=> I took the bus (a)   not to be late for the big meeting with the CEO.

He cannot take part in the big match on account of his injury problems. OF

=> (a)   injury problems, he cannot participate in the big match.

I cannot type very well. AT

=> I am (a)   .

He left but he did not say goodbye. WITHOUT

=> He left (a)   goodbye.

Why didn't she give you her phone number? REFUSE

=> Why (a)   you her phone number.

The concert was postponed until next week. PUT

=> The concert was (a)   until next week.

Is this pen yours? BELONG

=> Does (a)   to you?

My parents won't let me go out on weekends. ALLOWED

=> I (a)   out on weekends.