I'd rather _______ here if you don't mind.

She pretended _______ interested.

I'll never forget ________ to your mother for the first time.

We managed ________ up the hill.

She reminded him ________ his homework.

It is important _______ vocabulary everyday.

When train tracks were developed, engineers adopted this system as (10) ______ stop and go — and the same system continued with cars.

Of the light sources and (8) ______ glasses available at the time, he found that red was a particularly intense light, ...

... meaning it (9) ______ from the greatest distance.

Tim Guilford and Dora Biro at (2) ______ Oxford University followed pigeons in Oxford over a three-year period, ...