With friends like these

Put the verb in brackets into the correct present tense:

I (a)   (not/believe) a single thing you've told me!

Put the verb in brackets into the correct present tense:

I can't meet you now because I (a)   (do) my homework.

Put the verb in brackets into the correct present tense:

He usually (a)   (work) in an office in London.

Put the verb in brackets into the correct present tense:

At the moment he (a)   (work) in an office in Birmingham.

Put the verb in brackets into the correct present tense:

The sun (a)   (rise) in the East.

Put the verb in brackets into the correct present tense:

He's worried because now he (a)   (think) about his exam next week.

Put the verb in brackets into the correct present tense:

There are lots of students who (a)   (want) to leave the course today.

Put the verb in brackets into the correct present tense:

Students (a)   (give up) school in increasingly large numbers right now.

Put the verb in brackets into the correct present tense:

I (a)   (not / understand) your attitude these days.

Put the verb in brackets into the correct present tense:

Both the River Thames and the River Seine (a)   (flow) into the English Channel.